Snubnose Revolvers a.k.a. Belly Guns

In today's post, we will look at a class of weapon called snubnose revolvers, also sometimes called "belly guns" or "snubbies".

A snubnose revolver is a handgun that is designed for self-defense at short distances. In general, the term is used to refer to any revolver with a barrel that is 3 inches long or shorter. They were designed to fulfill the requirement of a small repeating handgun that could be concealed easily and drawn out quickly. The term "belly gun" might have come about because many people carried these weapons concealed in the trouser waist band, close to the belly. Other think that they're called belly guns because of the method of use: placing the barrel into the belly of the opponent and pulling the trigger.

One of the early revolvers of the snubnose type was the Colt Shopkeeper Special model, which was based off the Colt M1877 Lightning model. This was a double action revolver designed for .38 Long Colt cartridge and the Shopkeeper Special model had a smaller barrel and no ejector rod, to keep the size compact.

A Colt Shopkeeper Special revolver. Click on the image to enlarge. Public domain image.

In those days, Colt revolvers were side-loaders. In 1894, Smith & Wesson invented a revolver where the cylinder is mounted on a crane which can swing outward for unloading or loading the revolver, with an attached push rod and star ejector to easily extract the cases. This design, along with the double action mechanism is what we see today in many modern revolvers.

In 1927, Colt introduced their Colt Detective Special revolver model. It was based on their Colt Police Positive Special model, which was a six-shot revolver designed to fire the .38 Special cartridge. The Colt Detective Special used the same frame and six-round cylinder as the Positive Special model, but had a small 2 inch barrel (or in some models, the barrel was 3 inches long).

A Colt Detective Special, courtesy of http://www.adamsguns.com/. Click on the image to enlarge.

The new weapon immediately found popularity among police detectives who were tasked with missions that required them to dress like civilians. Soon after this, Colt discovered that there were a number of people that wanted a small concealed weapon. Therefore, they started making other models as well. For instance, the Colt Banker's model was based on the earlier Colt Police Positive revolver. The Colt Police Positive was designed for smaller cartridges (.32 Colt and .38 S&W) than the Colt Police Positive Special (which took .38 Special) and the Colt Banker's model was designed for the smaller cartridge, with the reasoning that weaker bankers wouldn't be able to handle the recoil of a .38 special cartridge.

The nice thing about such small revolvers is that they are easy to carry around in a pocket or a purse and have repeating capability. Another reason that many people preferred these to the larger models was because of the speed that these could be pulled out. Anyone who has used a full sized revolver from a holster knows that the gun is relatively heavy and the long barrel has to be pulled clear of the holster before shooting. The snubnose equivalent is much easier to pull out from the same holster.

After cheap semi-automatic pistols started becoming widely available in the early 1980s, the popularity of these revolvers declined in the US, mainly because pistols hold much more ammunition that revolvers do. Then, in 1994, the Federal Assault Weapons Ban passed for 10 years, which limited the availability of pistol magazines holding more than 10 rounds and suddenly, the popularity of these snubnose revolvers increased again, until the ban expired in 2004.

There are some advantages to snubnose revolvers:

1. Ability to conceal: These revolvers can easily be stored in a pocket or a purse. The curved grip is much easier to conceal than the straight grip of a semi-auto pistol and it doesn't look like a gun when placed inside a pocket.
2. Easy to pull out: Due to its smaller weight and size, it is easier to pull one of these out of a holster than the equivalent full sized revolver model.
3. Simplicity of use: It is much easier to teach someone to use a revolver than to use a semi-automatic pistol. Limp wristing is not a problem with revolvers, so even someone with a weak grip can use one. Revolvers are also less likely to malfunction than semi-automatics. If a revolver doesn't fire due to a bad cartridge, the procedure to clear it is to simply pull the trigger again. 
4. Heavy Double Action trigger: We saw a few posts ago that double-action triggers are harder to pull when placed in double-action mode. Therefore, it is not likely to go off, if it gets snagged in clothing, which provides extra safety.
5. Better at close quarters: Not only is it faster to pull a snubnose revolver out, the shorter barrel means that an attacker can't grab on to it and try to wrestle it away. Also, unlike a semi-automatic pistol, a revolver can't be easily knocked out of battery.
6. Can fire different types of ammunition.

On the other hand, there are some disadvantages as well:

1. Capacity: Most modern snubnose revolvers have a 5-round capacity, whereas even a pocket sized semi-automatic pistol carries 6+1 rounds. Of course, there are those that argue that 5 rounds is more than enough in most cases.
2. Higher recoil: Because of the smaller size and weight, the felt recoil force is much more on a snubnose revolver.
3. Sights: Due to shorter barrels, the distance between the front and rear sights is smaller and therefore the sight radius is short. The longer the sight radius, the more accurately a weapon can be aimed. 
4. More time taken to reload a revolver.

Due to their shorter barrel lengths, snubnose revolvers are perceived to have less accuracy than weapons with longer barrels. This is not entirely true, as they can be used pretty effectively to about 20 meters (22 yards) by most people and some people can even hit torso-sized targets up to 50 meters (55 yards) away.

These days, Colt no longer manufactures snubnose models (such as Detective, Cobra or Python), but Smith & Wesson still makes snubnose models (e.g. Bodyguard, Model 19 etc.), as does Ruger (SP101 and LCR).

More Developments in Lever Actions - The Birth of Two American Legends

Where we left off in our last post, the company formed by Horace Smith and Daniel Wesson was off to a bad start, as the lever action firearms that they made did not sell very well. Their chief financier, Courtlandt Palmer, had reorganized Smith & Wesson into the new Volcanic Army Company and managed to convince another group of investors (including Oliver Winchester) to buy their company. After this, Courtlandt Palmer got out of the firearms business completely, Horace Smith went back to his home in Springfield, Massachusetts, after selling his remaining shares in the company. Daniel Wesson stayed on as a factory manager at Volcanic Arms for 8 more months, before leaving as well. Benjamin Tyler Henry also left and went back to his old job at Robbins & Lawrence.

After this, Oliver Winchester moved the Volcanic factory to New Haven, Connecticut, where he already had a successful shirt manufacturing business. The Volcanic company nearly went bankrupt in 1857, due to poor sales. Oliver Winchester managed to acquire the remaining shares of the company and reorganized its assets under a new company called the New Haven Arms company. Meanwhile, he kept the patent rights of the Volcanic Arms company under his own name and licensed the rights to manufacture them to the New Haven Arms company. He also managed to convince 11 other investors to invest in this new company (7 of these investors owned shares in Volcanic as well), while retaining a controlling majority of shares.

In the beginning, sales were rather slow and the company was mainly kept running, due to personal funding by Oliver Winchester and his partner in the New Haven Shirt Manufacturing company, John M. Davies. Around April or May 1858, he managed to convince Benjamin Tyler Henry, who had gone back to Robbins & Lawrence, to rejoin and become the new factory superintendent. Henry had worked with Horace Smith and Daniel Wesson at various stages of development of the previous Jennings and Smith-Jennings rifles, so he was fully aware of the advantages and disadvantages of their products. He was convinced that while the lever-action principle was a good idea, the ammunition could be improved. Therefore, with the backing of Oliver Winchester, Henry set upon improving the metallic cartridge and initially produced a better cartridge in .38 caliber in 1859 and produced a few sample carbines and pistols using this cartridge.

Click on the image to enlarge.

However, Oliver Winchester decided that .38 caliber firearms would probably not sell very well and wanted a bigger cartridge. He also recognized that the future of lever-action firearms lay with rifles rather than pistols and therefore directed the company to concentrate on rifle development. With Winchester's backing, Henry came up with a .44 caliber rimfire cartridge and a rifle to fire it, in 1860.

Due to Oliver Winchester and John Davies expanding their shirt manufacturing factory in the beginning of 1860, they could not fund the re-tooling of the New Haven Arms factory to immediately manufacture the Henry design. Instead, they settled on making 3000 Walch pocket revolvers in .31 caliber for the Walch Arms company owned by Cyrus Manville of New York. By April 1861, Winchester's finances had improved so that he could fund the re-tooling process and the company started to deliver the new Henry rifles by 1862.

A Henry Rifle. Click on the image to enlarge.
Image licensed under the Creative Commons Attribution-Share Alike 3.0 Unported by Hmaag

Sales were initially slow, but then the Civil War started and demand for the Henry rifle increased. It is interesting to note that the US Government only purchased about 3140 Henry rifles before the war and 1731 Henry rifles during the war, but more of them were purchased by the soldiers privately, using their own money. The official repeating rifle of the US military was the Spencer rifle, which was also a repeating lever-action weapon and much more sturdy than the Henry rifle. However, despite the relative fragility of the Henry rifle and its lesser power than the Spencer rifle, it had two big advantages over the Spencer rifle:

1. It had a larger magazine capacity (16 cartridges, compared to the Spencer's 7 cartridge capacity)
2. It had a faster rate of fire. Manipulating the lever on the Henry ejected the old cartridge, loaded the new cartridge and also cocked the rifle, all in one motion. The Spencer rifle, by contrast, required the user to cock the rifle separately.

Therefore, individual soldiers in the Union Army saved up to buy Henry rifles, using their own money and they purchased more rifles than the US Government did. To the Confederate soldiers who were armed with slow single shot muzzleloading rifles, a Union soldier armed with a fast firing 16-shot repeating rifle was a deadly opponent. In fact, confederate soldiers called the Henry rifle as "the damned Yankee rifle that they load on Sunday and shoot all week!"

While the Henry rifle sold well, it had some flaws that made it somewhat unsuitable as a military weapon (such as mud and dust entering the open magazine slot and causing it to not feed cartridges properly), so the New Haven Arms company worked to improve the design. Meanwhile, the shirt manufacturing business owned by Oliver Winchester and John M. Davies started doing so well that they retired from that company on January 1st, 1865 and left it to their respective sons to run, so that they could concentrate their efforts on managing the New Haven Arms company. Shortly afterwards, Oliver Winchester went on a trip to Europe, to try and market the Henry rifle to European countries. While he was travelling in Europe, Benjamin Tyler Henry was angered by what he thought was inadequate payment for developing the rifle, and attempted to acquire the rights of the New Haven Arms company (which he still owned shares in), in collaboration with the company secretary, Charles Nott. They petitioned the Connecticut state legislature to change the name of the company to the Henry Arms company. When Oliver Winchester heard about this in May 1865, he immediately sent a telegram to John M. Davies to present the Henry Arms company with all the debts that the New Haven Arms company owed him. Meanwhile, he hurried back to the US and tried to prevent the New Haven Arms company from operating under its new name. Since he could not prevent this, he decided to form his own Winchester Firearms company. 

The formation of this new company was not that hard, since it turned out one of New Haven Arms factories in Bridgeport was actually leased under Oliver Winchester's name and not the company. He had also paid to equip this factory personally, and not the New Haven Arms company. Therefore, he had a factory already equipped to manufacture firearms and could reduce the New Haven Arms company's production by over 50% immediately. On top of that, he owned many of the machinery used for production, therefore many of the other shareholders voted to keep him as president of the New Haven Arms company. Nevertheless, he formed Winchester and set about producing an improved version of the Henry rifle, which became the Winchester Model 1866. This used the same .44 caliber cartridge, but improved the magazine to prevent the jamming issues, by making a closed magazine that could be loaded via a hinged gate at the bottom of the receiver. The design was modified sufficiently to prevent Benjamin Henry and the Henry Arms company from suing Winchester. From this came the birth of one of American's leading firearm companies.

Meanwhile, at the beginning of this article, we had mentioned that Horace Smith had gone back to his home in Springfield, after the sale of the Volcanic Arms company to Oliver Winchester, and 8 months later, Daniel Wesson had left the company as well. Neither of them had been idle after they left the Volcanic Arms company. While Samuel Colt had a patent on revolvers, his revolver patent was due to expire in 1856. Anticipating this, Daniel Wesson began working on a new revolver design. At that time, most revolvers were percussion cap fired and the user would have to pour black powder into each of the six chambers of the cylinder, then push a bullet into each chamber, and then load the percussion caps on the rear of the cylinder, making the whole reloading process cumbersome. Daniel Wesson began working on a design that would use metallic cartridges to load the revolver, thereby speeding up the whole loading process. To do this, he needed to develop a revolver design where the cylinder was bored through and could be loaded from the breech. While he was doing this research, he realized that this concept had already been developed by a former Colt employee named Rollin White, who held the patent for the design. Immediately, Daniel Wesson went to Springfield, Massachusetts and contacted his old friend, Horace Smith. Together, they formed a new Smith & Wesson company to manufacture revolvers and approached Rollin Smith for his patent. Rather than make him a partner in their new company, they offered him a royalty of $0.25 for every revolver manufactured by them. This meant that they were free to manufacture revolvers, while the job of defending the patent from other infringers was White's responsibility. Due to this arrangement, Rollin White lost a lot of money battling court cases, while Smith & Wesson prospered.

Smith & Wesson Revolver Model 1. Click on the image to enlarge. Public domain image.

The new revolvers were an immediate success and sold very well that by 1860, Smith & Wesson had to expand into a new factory. The US Civil war only increased the demand as Smith & Wesson revolvers were purchased privately by many soldiers on both sides. Rollin White even started a separate factory to supply revolvers to Smith & Wesson, to keep up with the demand. Other manufacturers also started to manufacture similar revolvers and therefore, Rollin White sued them in court. He won many of these cases and therefore, the offending companies were forced to stamp "Manufactured for Smith & Wesson" on the revolvers that they made. Despite winning many of these cases, Rollin White did not make much money himself, as he spent most of his earnings on paying lawyers.

After the end of the Civil War, Smith & Wesson started manufacturing revolvers suitable for the American west and also started selling to the US Army, Russia, Australia etc.

So there you have it, from the Walter Hunt rocket ball patent to the birth of two US firearms giants, Winchester and Smith & Wesson.

How did they name cartridges - II

When we left off in our last post, we saw that cartridges like .45-70 and .50-90 were named based on their caliber and the amount of black powder in it (e.g. .45-70 has a bullet of .45 inches in diameter and 70 grains of black powder). We also saw that if two different bullet weights were available for the same cartridge, then a 3 number scheme was used (e.g. .45-70-405 and .45-70-500, where the 405 or 500 indicates the weight of the bullet in grains). We will continue our discussion in this post.

With the invention of newer smokeless powders, cartridges still retained the same two digit naming scheme as before: e.g. the famous .30-30 Winchester rifle, .32-20 Winchester or the .30-40 Krag, which replaced the .45-70 in US military service. As before, the first number indicates the caliber (e.g. 0.30 inches diameter) and the second number indicates the amount of smokeless powder in grains.

After some years, people began to drop the amount of grains and use the year that the cartridge was introduced instead. For instance, the Springfield .30-06 cartridge. This cartridge's diameter is 0.30 inches and it was introduced in 1906 (from which we get 06) and therefore it was named as .30-06. The .30-06 actually replaced the .30-03, which was, predictably, adopted in 1903.

Some years after that, people began to drop the second number altogether and simply name the cartridge after the caliber and the company that introduced it  (e.g.) .44 Colt introduced by Colt firearms, .32 S&W invented by Smith and Wesson etc. Sometimes they were named after a specific product (e.g.) .45 ACP where ACP stands for Automatic Colt Pistol. Sometimes they were named after specific attributes (e.g.) .38 Special, .44 Magnum, .577 Express etc., where the words Special, Magnum or Express indicate that these cartridges have extra power.

By the 1950s, people also started to name the first number by the groove diameter of the rifle, rather than the bore diameter of the bullet (at least in America). For instance, .308 Winchester, where the bore diameter is 0.300 inches, but the groove diameter is 0.308 inches.

Over in Europe (except for the UK), people generally use the metric system and name cartridges with two sets of numbers separated by an "x". e.g. 7.62x51, 5.56x45 etc. The first number is the bore diameter of the bullet in millimeters (e.g. 7.62 mm., 5.56 mm. etc.) and the second number is the length of the case in millimeters (e.g. 51 mm., 45 mm. etc.). Note that the first number is the bore diameter, not the groove diameter. Therefore, what we call the .308 Winchester in America actually has a bore diameter of 0.300 inches and a groove diameter of .308 inches and the Europeans take the 0.300 inch measurement and convert that into millimeters (7.62 mm.) and use that in their cartridge nomenclature. This system is generally used in the rest of the world as well (Asia, Africa, South America, Oceania etc.)

The British tend to name their cartridges in American fashion, e.g. .244 H&H Magnum (where H&H stands for Holland and Holland, a famous British firearms firm), .455 Webley (invented by Webley, another British firearms manufacturer) .700 Nitro Express etc. The numbers indicate the diameter of the bullet rather than the groove diameter though.

These are generally the naming schemes in vogue these days, but there are exceptions to the rule. American manufacturers in particular, tend to add names that sound good to consumer ears: e.g. .22 Hornet, .221 Fireball, .224 Rocket etc. Also, there are cartridges such as the .280 Remington (which actually has a bore diameter of 0.277 inches and groove diameter of 0.284 inches) and the .260 Remington (which actually has a bore diameter of 0.256 inches and groove diameter of 0.264 inches). Remington's marketing people decided that customers like numbers that end in zero better, so they named then .280 and .260 instead.

As you can see, these are several ways how cartridges have been named throughout history.

How did they name cartridges - I

In the world of firearms history, we often see famous cartridge names like .30-30 Winchester, .45 ACP, .30-06 Springfield etc. So how exactly do cartridges get named and is there some meaning behind their naming convention. We will study those in this post.

Bear in mind that cartridges are not always referred by the same name throughout history. For example, when Smith & Wesson produced their first revolver model, they made it fire a .22 cartridge, which was then referred to as a ".22" or a ".22 caliber" in 1857, since there were no other cartridges with the same caliber bullet. This cartridge contained 4 grains of black powder in it and a bullet weighing 29 grains (or 2 grams in the metric system) and measuring .222 inches in diameter. In 1871, Smith & Wesson produced another cartridge in .22 caliber diameter. This cartridge used the same 29 grain bullet as its predecessor, but the case was a bit longer than the older one and contained more black powder (5 grains), in order to produce extra power. Therefore, they began to refer to the old .22 cartridge as ".22 Short" and the new one as ".22 Long". Both these cartridges were used for revolvers. Soon afterwards, Remington, Stevens, Winchester etc. started producing the ".22 Extra Long" for rifles and revolvers. This cartridge used a 40 grain (3 gm.) bullet and a longer case that contained 6 grains of black powder in it. Then, the Stevens Arms and Tool Company combined the case of the .22 Long with the 40 grain bullet of the .22 Extra Long to produce the ".22 Long Rifle" (a.k.a. ".22 LR" cartridge).

Public domain image of different .22 caliber cartridges.

The .22 LR became very successful and still remains the most popular cartridge in the present day. Therefore when someone talks about ".22 caliber" in today's world, they are almost certainly referring to the .22 LR cartridge. However, back between 1857 and 1871, when someone said ".22 caliber" they would have been referring to what we now call ".22 short". So you can see how common cartridge designations have changed over the years.

For some early cartridges, they were named with two sets of numbers. For instance, right after the US Civil War, the US government issued the ".50-70 Government" cartridge for use with the Springfield Model 1866 rifle. This was later replaced by the ".45-70 Government" cartridge in 1873. So what do the numbers .50-70 and .45-70 mean? For a ".50-70", it means that the cartridge has a .50 caliber bullet and 70 grains of black powder. Similarly, a ".45-70" has a .45 caliber bullet and 70 grains of black powder. This naming scheme was also used for other cartridges such as the ".50-90 Sharps", ".50-100 Sharps", ".50-110 Winchester" etc.

In some situations, these cartridges were also referred to with three sets of numbers, such as ".50-70-450" and ".45-70-405" where the third number indicated the weight of the bullet in grains. This was done as cartridges of the same size, but with different bullet weights, became common. For instance,  the .45-70 cartridge case was used for two different bullet weights and to tell them apart, the two cartridges were called .45-70-405 and .45-70-500, when the 500-grain-bullet variant was invented in 1884.

In the next section, we will look more into the conventions used to name cartridges.

Self Lubricating Bullets

Your humble editor recently came across an interesting book called "Modern American Pistols and Revolvers". The book dates from 1896 and describes the state of firearms that was considered "modern" in that era. Among its many pages was a mention of something called a self-lubricating bullet.

Self-lubricating bullets seem to have been invented by Daniel B. Wesson, one of the founders of Smith & Wesson. He received a patent for his design in 1893. During this era, fouling in firearms was a big problem because smokeless powders hadn't been invented yet and black powder left a lot residue behind in the barrel. Excessive fouling would cause the finest revolvers in the world to become inaccurate, especially when they were shot rapidly in dry conditions.

Smith & Wesson self lubricating bullet. Click on image to enlarge. Public domain image

In the above image, we see a Smith & Wesson self-lubricating bullet. The bullet has a hollow core in its base, about 1/8th inch in diameter. Inside this core, a copper plug is inserted and the core is filled with lubricant A. The base of the core has a brass plug B. Four tiny passages C are drilled along the side of the bullet and these passages are also filled with lubricant.

Self-lubricating bullet when fired. Click on image to enlarge. Public domain image.

When the bullet is fired, the brass plug B is pushed inside the bullet by the expanding gases, thereby forcing out the lubricant out of the passages C in the conical front of the bullet. The theory was that the lubricant would distribute itself to the walls of the barrel and keep it moist. The black powder residue, which is very hot, would cool down more rapidly because of the lubricant and adhere only loosely to the barrel and could be cleaned easily with only a wire brush.

The book goes on to say that this cartridge was tested by the US Government and seemed to show more accuracy than using regular ammunition, while being slightly more expensive. Smith & Wesson used this idea for several of their cartridges, .38 S&W, .38 Special, .32 S&W, .32 S&W Long, .44 S&W Russian etc.

With the invention of more modern and cleaner burning powders, this type of bullet seems to have lost its popularity.

Actions: Recoil Action: Short Recoil Operation

In our previous post, we studied the basics of recoil operated actions. In this particular post, we will study one of the types of recoil operated actions, i.e. the short recoil operation.

This action type has a long history, being the action that was used in the first machine gun ever invented, i.e. the Maxim machine gun. It is also the action of choice for most semi-automatic and automatic pixels that use 9 mm. Luger (9x19 mm.) cartridges or bigger. Smaller and lower powered cartridges are used with blowback actions that we studied last month, but once the cartridges get beyond a certain size and power, a blowback action cannot be used any more and most modern pistols therefore use a short recoil operation.

As we noted in our previous post, one of the key differences between a blowback action and a recoil operated action is that a recoil operated action has the bolt (i.e. the metal block that holds the cartridge in the chamber before firing) is locked at the point of firing, whereas a blowback action merely has it held under spring pressure. This enables the recoil operated action to fire heavier cartridges. Also, as we noted previously, in a recoil operated action, some parts of the weapon are allowed to recoil backwards, whereas other parts are held stationary relative to the recoiling parts. In a short recoil action, the parts that are allowed to recoil are the barrel and the bolt.

At the point when the bullet is fired, the barrel and the bolt are locked together and move backwards due to recoil. After a short distance of travel (a few mm. in the case of pistols and a few caliber lengths in the case of machine guns), the bolt and the barrel disengage from each other. How this is achieved is what differentiates various short recoil operation systems. In some cases, the barrel is slowed down, in other cases, the bolt is accelerated. In either case, the barrel stops moving, whereas the bolt continues to move backwards and compresses a recoil spring and also extracts the old cartridge case at the same time, which is ejected via a side port. The recoil spring then pushes the bolt forwards and as the bolt moves forwards, it picks up the new cartridge from the magazine and pushes it and the barrel forwards. When the barrel reaches its forward position again, the bolt and barrel lock again and the weapon is ready to be fired.

As was mentioned above, in some systems, the barrel is slowed down to separate the barrel from the bolt. Weapons that use this include the classic Colt M1911 pistol designed by John Browning, all Glock pistols, Smith & Wesson, FN Browning, SIG Sauer etc.

In the case of the Browning designed Colt M1911, the bolt, barrel and slide all move backwards together initially, but then a barrel link tilts the barrel downwards. As the barrel tilts, the barrel locking lugs unlock themselves from the slide recesses. The bolt and slide continue to move backwards and an extraction claw on the slide also pulls the spent cartridge out of the chamber.

An ejector strikes the back of the spent cartridge and pushes it out of the extraction port, as the slide and bolt continue to move backwards. When the slide and bolt reach the back of the pistol, the recoil spring pushes them forward and during the forward motion, the slide locks back into the barrel and the three pieces then move back together. The two animated movies below show how this works.

In the case of Glock, SIG Sauer and most recently designed automatic pistols, this mechanism is even more simplified. There is a downward inclined ramp attached to the back of the barrel. As the barrel and slide move backwards, the ramp contacts a fixed stud on the pistol's frame. This causes the back of the barrel to move down (and the front to tilt up), which moves it out of engagement with the slide. The rest of the action is similar to what was described earlier. The animation below shows exactly how this works:

In the above three animations, the one thing is common is that the bolt and barrel initially move backward together and are then separated by slowing down the barrel while leaving the bolt and slide free to continue moving backwards.

Another way to achieve this separation is by accelerating the bolt after they both move back together. This mechanism is most commonly used today in the 7.62 mm. and 12.7 mm. M2 machine guns invented by (surprise, surprise) John Browning! The 12.7 mm. M2 is still used in the famous Abrams tank, as well as most other western tanks, which shows the reliability and timelessness of this design. In the M2 machine gun, the barrel and bolt initially recoil together about 10 mm. backwards and then a rotating cam in the receiver disconnects the bolt from the barrel. The barrel has an extension in the back and bottom of the barrel. After the bolt and barrel are disconnected, this extension then strikes a short, curved lever. The lever is pivoted so that it has a mechanical advantage and therefore it pushes and accelerates the bolt rearward. A fixed stud stops the barrel extension, which also halts the barrel, while the bolt continues rearward. As before, we have an animation to show how it works:

We will continue studying short recoil operations tomorrow, where we will deal with some more historical short-recoil operated weapons such as toggle-bolt short recoil actions. It'll be interesting reading!

Revolver: Modern Revolvers

When we last left off on revolver developments, we'd studied single and double action revolvers and the beginning of metallic cartridges replacing percussion caps.

Because of the rapid fire capability of the double-action mechanism, it became the mechanism of choice for new revolvers. Today, most modern revolvers are still double-action. Even Colt, the proponents of single-action pistols, switched to double-action models by the end of the 1800s with their Colt New Service Revolver. Models by Smith & Wesson, Remington, Webley etc. were very popular as well.

By the 1850s or so, metallic cartridges began to replace percussion cap technology. Some revolvers, such as the French-made Lefaucheux, were built to use pinfire cartridges. In 1857, Smith & Wesson introduced their first revolver which used a .22 short rimfire cartridge, also developed by Smith & Wesson. This model was a huge success in the market-place and was responsible for establishing the fame of Smith & Wesson. By the mid 1860s, centerfire cartridges became popular and revolvers began to use them as well (such as the Colt Peacemaker). Most of the early metallic cartridges still used black powder as their propellant, but more powerful smokeless powders started to become popular after 1886 or so and revolver manufacturers began to certify their weapons as safe to be used by smokeless powders as well. This meant using new metallurgical techniques of manufacturing weapons to withstand the higher pressures generated by smokeless powders.

As more powerful cartridges were developed, revolvers were built to fire them as well. In the 1950s, the .44 magnum cartridge, introduced by Elmer Keith and built by Remington, was used by the Sturm-Ruger Blackhawk and the Smith & Wesson Model 29 revolvers. Unusually, the Sturm-Ruger Blackhawk was a single-action revolver, rather than a double-action model. Ruger discovered that after Colt had pulled out its popular Colt Peacemaker (another single-action model) out of the market, there was still some demand for single-action weapons and went on to fill that demand. Company legend at Sturm-Ruger has it that Smith & Wesson were experimenting with the new .44 magnum cartridge in secret, but a Sturm-Ruger employee found the empty cartridge cases in a garbage pile and took one to Bill Ruger and the Blackhawk revolver beat Smith & Wesson's model 29 revolver to the market by several months. The S&W Model 29 didn't sell well initially, but in 1971, the movie "Dirty Harry" came out, with Clint Eastwood's character, "Dirty" Harry Callahan, describing the S&W Model 29 as the "most powerful handgun in the world". While this was not strictly true at this point (the .454 magnum was already developed), this line of movie dialog made the demand for the Model 29 to skyrocket, to the point that dealers were having trouble keeping the Model 29 in stock, even after selling them at triple-price! These days, there are revolvers built to fire even more powerful cartridges, such as the .454 and the .5oo magnum, but the Model 29 sales still remain high, 35 years after the movie came out.

Revolvers used to be the weapon of choice in military and police departments around the world, until modern semi-automatic pistols such as the Colt M1911 became more popular due to shorter reload time and higher capacity of cartridges. Police departments in the United States continued to use revolvers well into the early 1990s, when they began to be replaced by semi-automatic pistols. They are still popular in the civilian market as sporting or hunting weapons. In fact, many trainers recommend new shooters to start off with a revolver.