Best Gun - 2

In our previous post, we looked at the term "best gun". As we found in our previous post, this is a term that is used to refer to a high-quality double barreled shotgun with some very specific features in it. Quite a few of these are manufactured by British firms, especially London based ones, but they are not the only ones. W.W. Greener and Westley Richards, both from Birmingham, also manufacture "best guns", as do firms from other countries around the world.

Italy also has some well-known best gun makers, such as Piotti, Fabbrica Armi d'Abbiatico e Savinelli (FAMARS), Beretta, Fabbri, Benelli etc. Their products (and prices) are comparable to some of the finest British firms. These firms are usually located in Northern Italy, which was a traditional firearms manufacturing center for centuries. The town and region of Brescia was known for its fine firearms for at least 500 years and before that, it was a hotbed for production of swords for the Roman legions.

A best gun made by Piotti of Italy. Click on image to enlarge.

A best gun made by Fabbri of Italy. Click on image to enlarge.

The above two examples show the fine work of their manufacturers. The model made by Fabbri sells for over $250,000!

Not to be outdone, we have manufacturers from Spain and Belgium as well. The Spanish city of Eibar in the Basque Country region is a traditional gunmaking town from the middle ages, as is the town of Liege in Belgium. Predictably enough, the well known manufacturers of best guns come from these regions as well. Spanish best gun manufacturers such as Pedro Arrizabalaga, Armas Garbi, Grulla Armas etc. have a good reputation in the market.

A best gun made by Pedro Arrizabalaga. Click on image to enlarge 

A best gun made by Armas Garbi. Click on image to enlarge.

Spanish best guns are generally priced well below their English or Italian counterparts, but they are still very high-quality firearms.

The city of Liege in Belgium was also a traditional hotbed of firearms manufacturing since the 1400s or so. The various manufacturers based around this city used to produce firearms of varying qualities: see our discussion on spurious firearms for some low quality specimens. It has also produced some very high-quality products as well. Most of the manufacturers in and around Liege have gone out of business at the present time, but there are a few small manufacturers still in business and also the 800 lb. gorilla, Fabrique Nationale (FN), which continues to make best guns along with military rifles, pistols, revolvers etc. These guns normally retail for about $15,000- $80,000 or so.

Germany also had a few best gun manufacturers in history, mostly located around the town of Suhl, which (surprise, surprise) has a long history of gunmaking. After World War II, the town of Suhl went to East Germany and thus, the firearms industry in that town went into decline, as the communist government strongly discouraged private arms manufacturers. After German reunification, the town has recovered some of its former glory -- the school of firearms engraving and the Guild of Master Gunsmiths are now both located here. The only major manufacturer still in Suhl is the firm of Merkel, but some of the other well known German manufacturers such as J.P. Sauer & Sohn, Krieghoff etc. moved to West German towns after World War II and are still in business. J.P. Sauer & Sohn, founded in 1751, is well-known for their SIG Sauer line of pistols, but they also manufacture best guns.

German best guns tend to be heavier than their English or Italian counterparts and tend to be very strongly built. They also tend to have deeper engraving. Because their style is different from the "London Best" style followed by British, Italian and Spanish manufacturers, the demand is lower and hence they are lower priced. However, they have very good strength and quality of workmanship.

Finally, we have the United States. At one time, there were many best gun manufacturers in the good ol' USA: Remington, Parker, Winchester, Lefever, Ithaca etc. Most American best guns are heavier than their English, Italian or Spanish counterparts because they are designed to fire stronger American shotgun cartridges. American best guns are generally built for mass production, hence many lack some of the characteristics of the very best British, Italian or Spanish guns. However, the quality of engraving, checkering and finish are excellent on the high-grade guns and are comparable to other best gun products from other manufacturers. There are still manufacturers in the US that are building replica models of some of the finest shotguns made in the last couple of centuries.

Actions: Gas Operated: Long Stroke Piston

In our last post, we studied the gas operated, short stroke piston action. During this post, we will study the other gas operated action that uses pistons, the long stroke piston. This is a mechanism that was used by the American M1 Garand rifle (not the carbine, which uses a short stroke piston), the Soviet AK-47 family (and its various derivatives made in other countries, such as the Israeli Galil, Finnish Valmet etc.), the Belgian FN FAL assault rifle etc.

Like the short stroke piston we've already studied, when the cartridge is fired, hot high pressure gases are generated which push the bullet out of the barrel. Most of these hot gases also escape behind the bullet, but some of it is tapped out and used to operate the extraction and reloading mechanism to eject the spent cartridge and load the next cartridge.

Click to enlarge image

Original file licensed under GNU Free Documentation License version 1.2 by user Thuringius, on en.wikipedia.org

In the above image, (1) is the gas port from which a portion of the hot gases leaving the barrel are tapped. (2) is the head of the piston and (3) is the piston rod. (4) is the bolt that holds the cartridge in place in the breech and (5) is the bolt carrier that moves the bolt. (6) is the return spring.

Initially, the bolt holds the cartridge in place in the breech chamber. When the trigger is pulled, it releases the hammer (not shown in the image above), which strikes the base of the firing pin (not shown in the image above). The other end of the firing pin strikes the base of the cartridge, which detonates its primer. The primer in turn, causes the propellant of the cartridge to burn and generate hot, high pressure gases. The generated gases expand and push the bullet out of the barrel.

Click to enlarge image

Original file licensed under GNU Free Documentation License version 1.2 by user Thuringius, on en.wikipedia.org

As the bullet is pushed out of the barrel, some of the high pressure gases generated by the exploding cartridge are tapped via the port (1) and enter the tube containing the piston. The high pressure gases act upon the piston head (2) and push it backwards. Since the piston rod (3) is connected to bolt carrier (5), they move backwards, compressing the return spring (6). At the same time, the bolt carrier (5) also picks up bolt (4) and moves it backward at the same time. The bolt has an extraction pin that picks up the spent cartridge case and pulls it out of the breech. As the spent cartridge moves backwards, it is ejected out of the gun via a side port. The piston, bolt carrier and bolt continue to move backwards and re-cock the gun. Meanwhile the high pressure gases acting on the piston head (2) are dissipated via a vent hole in the tube. When the bolt carrier moves backwards to its maximum, the compressed return spring (6) pushes it forwards again. This moves the piston, bolt and bolt carrier forward again and on the way forward, they pick up a new cartridge from the magazine and push it into the breech chamber. Now the weapon is ready to fire again.

In the above animation, you can observe clearly how the mechanism works (including the hammer and firing pin, which were not present in the images above).

The main difference between the long stroke piston action and the short stroke piston action is that in a short stroke action, the piston moves back violently only a short distance (usually less than its own diameter) and then it is stopped by a projection. The bolt carrier then separates from the piston and continues to move backwards due to momentum. As a result of this, a short stroke piston action generally taps gases from closer to the breech (closed end of the barrel). In a long stroke action, the piston moves a distance greater than the length of the cartridge. In fact, the piston stays attached to the bolt carrier throughout the operation. This causes the piston to have greater dwell time and therefore, long stroke piston weapons generally tap their gases closer to the front end of the barrel (the muzzle). It also means that the operating parts are longer and therefore heavier than that of a short stroke piston action.

The advantages of this type of action are many. Like the short stroke piston action, the hot, high pressure gases only act upon the piston head and therefore, the other operating parts (the bolt, bolt carrier, trigger assembly, hammer, firing pin, return spring etc.) are not exposed to the hot gases or the dirty residue at all. These weapons can therefore accept a wide variety of cartridges using different quality propellants, since the dirty residue from low-quality propellants does not have a chance to contact most of the key operating parts of this action. This means a more reliable action and ease of maintenance of the weapon. The extra weight of the piston rod acting on the bolt carrier means more positive extraction, chambering and locking of the cartridges.

There are also some disadvantages. The main one is that the mass of the moving parts alter the center of gravity of the weapon and thereby make it harder to keep the weapon pointed on target, especially when firing in automatic mode. The abrupt stops and starts of the bolt carrier, piston and bolt at either end of the cycle also contribute to the shaking. Also, because the operating parts are longer, the overall weight of weapons that use this action are a bit heavier than short stroke piston actions.

Actions: Gas Operated: Short Stroke Piston

The first gas operated mechanism we will study today is called the short stroke piston. This is the mechanism that is used in rifles such as the American M1 carbine and M14 rifle, the Belgian Fabrique Nationale SCAR assault rifle, the British SA80 assault rifle and the German Heckler & Koch G36 assault rifle.

When a gas operated weapon is fired, the cartridge generates hot gases, which push the bullet out of the barrel. Most of the gas also leaves the barrel behind the bullet, but a portion of the gases are tapped out and used to operate the extraction and reloading mechanism, to eject the old cartridge and load a new one.

The basic idea behind a short stroke piston mechanism is that when the cartridge is fired, some of the expanding gases are tapped by a port close to the firing point or the middle of the barrel. This means that the gas here is at relatively high pressure (compared to if the gas was tapped close to the open end of the barrel). This high pressure gas is then allowed to act upon a piston. The other end of the piston touches the bolt carrier of the rifle. When high pressure gas acts upon the piston face, it pushes the piston back very rapidly, which in turn pushes the bolt carrier back. The piston moves back for a very short distance (generally, a distance that is less than its own diameter) and is then abruptly stopped, either by a projection, or by a gas cut-off. The bolt carrier separates from the piston and continues to move back on its own, due to the kinetic energy imparted to it by the piston. The bolt carrier drags the bolt backwards, which extracts the fired cartridge out and ejects it via a side port. They continue moving backwards and cock the rifle again, ready to fire. When the bolt carrier reaches its most backward position, a return spring pushes it forward again. On its way forward, the bolt picks up a new cartridge from the magazine and pushes it into the firing chamber. As it reaches its forward most position, the bolt locks and the weapon is ready to fire again.

The animation above shows the mechanism of the LWRC short stroke piston mechanism. It only shows the movement of the piston and not the bolt-carrier or bolt, but you can get a good idea of how it works. Note how the hot gases are vented out close to the middle of the rifle.

There are some advantages of the short stroke piston system. Like all gas-operated piston systems, the hot gases only impinge on one side of the piston and the other end of the piston rod pushes the rest of the mechanism. This means that all the hot gases and carbon residue are kept away from the rest of the operating mechanism, which improves reliability and life of the operating parts. Also, since the piston is stopped very quickly, the total mass of recoiling parts is smaller and therefore this makes the weapon easier to control. The other advantage is that shorter barrels can be used with short stroke piston systems.

Actions: Recoil Action: Long Recoil Operation

In the last few posts, we talked about a particular type of recoil action called the short recoil operated action. In this post, we will talk about another type of recoil action, the long recoil operated action.

This action is actually one of the older recoil operated actions in existence, being over 100 years old at least. It is commonly used in naval guns or artillery, but not as mucsh seen with small arms. When it comes to small arms usage, it is mostly used by some well known semi-automatic and automatic shotgun designs. The long recoil action shotgun was originally designed by the famous gun designer, John Browning in 1898 and patented in 1900. This action is very rarely used for pistols and there is only one (Frommer pistol) that used it for a pistol.

In a long recoil operation, the bolt and barrel are allowed to recoil, similar to that of a short recoil operation. At the point when the bullet is fired, the bolt and barrel are locked together. As the weapon fires, the bolt and barrel move back together due to the recoil. They continue to move together backwards until they reach the back of the receiver and recock the hammer. At this point, the bolt is held in the back of the receiver by a catch. The barrel is then pushed forward by a barrel spring and returns completely forward, during which time the spent cartridge case is ejected. When the barrel has reached its fully forward position, the bolt is then released from the back and pushed foward by another spring. As the bolt moves forward, it picks up a new cartridge from the magazine and pushes it into the barrel chamber.

As you can see in the illustration above, the first image shows the bolt and barrel right after the bullet has been fired. Note that the bolt and barrel each have their own individual recoil springs. The second image shows the bolt and the barrel moving backwards due to the recoil until they reach the end of their travel, whereupon the bolt hooks on the catch and is left held there. Meanwhile, the barrel recoil spring uncompresses and pushes the barrel forward, as shown in the third image. When the barrel reaches its forward position, it releases the catch that is holding the bolt back in the third image and the bolt is then pushed forward by the bolt recoil spring.

Compared to the blowback actions we've studied previously, this type of action can handle much heavier loads.

Compared to the short recoil operated action, there are some significant differences.

1. When the weapon is fired, the bolt and barrel move back together initially, just like in a short recoil operated action. However, in the short recoil operation, the two move back together only a few mm. at most, before the barrel stops while the bolt continues to move backwards. In the long recoil operated action, the separation of the bolt and barrel happen much later. In fact, in a long recoil operation, the bolt and barrel move all the way backwards until they reach the end of their travel in the back of the receiver.
2. Short recoil actions tend to have only one return spring. Long recoil actions have separate return springs for the barrel and the bolt.

Since the bolt and barrel are much heavier than the bullet and since they move backwards together a long way compared to a short recoil operation, the cycle time of shooting and reloading is much slower compared to a short recoil action or a blowback action. On the other hand, the longer cycle time leads to slower, smoother operation.

The long recoil operated action was used in the John Browning designed Auto-5 shotgun, which was the first semi-automatic shotgun. This shotgun was originally designed in 1898. The Browning Auto-5 model was designed with the intention of making it suitable for mass production and the design was licensed out to various manufacturers, such as FN, Remington, Savage arms, Franchi etc. and remained in production until 1999. This makes this model one of the most successful shotguns in history.

Remington Model 11 shotgun, which uses the Browning designed long recoil action.

Public domain image.

When John Browning had originally designed the Auto-5, he intended to sell the design to the Winchester arms company, since he had already sold several designs to them previously. However, Winchester was not prepared to pay the amount of royalty that Browning demanded, so he went to Remington next. Tragically, the Remington deal fell through, as the president of the Remington company died of a heart attack during the negotiation period. Hence, John Browning went to Europe and licensed the design to Belgium's Fabrique Nationale (FN). Later on, Remington licensed the design again and used it with their Model 8, Model 11 and Sportsman model shotguns. The design was also later licensed to Savage Arms of the US, Franchi and Breda of Italy and Tula State Arsenal (TOZ) of Russia. The French designed Chauchat light machine gun of World War I also used a version of the Browning long recoil action mechanism. While the Chauchat was mostly a failure, the shotguns remained in use for a very long time indeed.