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Free recoil / Frecoil is a vernacular term or jargon for recoil energy of a firearm not supported from behind. Free recoil denotes the translational kinetic energy ( E t ) imparted to the shooter of a small arm when discharged and is expressed in joules (J), or foot-pound force (ft·lb f ) for non-SI units of measure.
Loads for waterfowl will tend to produce more felt recoil in a 12-gauge shotgun than in a 20, but this may not be the case depending on the gun used. [9] Full-power 20-gauge shells fired from a light 5 lb (2.3 kg) gun will have more felt recoil than those fired from a heavy 7 lb (3.2 kg) gun. [ 11 ]
Military use of combat shotguns through the 20th century has created a need for ammunition maximizing the combat effectiveness of such weapons within the limitations of international law. 12-gauge has been widely accepted as an appropriate bore diameter to provide an effective number of projectiles within an acceptable recoil. Early 12-gauge ...
The Model 11-87 is a gas operated semi-automatic shotgun.Upon firing a shell, some of the high-pressure gases from the burning propellant are diverted through two small holes under the barrel, [2] forcing the bolt toward the buttstock, which in turn ejects the spent shell.
The AA-12 (auto assault-12), originally designed and known as the Atchisson Assault Shotgun, is an automatic combat shotgun developed in 1972 by Maxwell Atchisson. However, the original development by Atchisson seems to have produced only a few guns at prototype-level, with the development that ultimately led to the gun entering the market being done later by Military Police Systems, Inc. [6 ...
For a gun firing under free-recoil conditions, the force on the gun may not only force the gun backwards, but may also cause it to rotate about its center of mass or recoil mount. This is particularly true of older firearms, such as the classic Kentucky rifle , where the butt stock angles down significantly lower than the barrel, providing a ...
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The French Chauchat, German MG 34 and MG 42 machine guns, the British Vickers machine gun, and some other recoil operated firearms use a gas trap style mechanism to provide additional energy to "boost" the energy provided by recoil. This "boost" provides higher rates of fire and/or more reliable operation.