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The manufacturer's mark, along with the proof marks, and the weight of the barrels in grams, and the proof test pressures are also stamped alongside the choke marking on the tang of the barrels, near where the shells are inserted into the barrels. In practice, choke tubes tighter than "Full", such as "Turkey", are also commonly marked with but ...
The weapon has two hammerless shotgun barrels with a single rifle barrel underneath, firing two 12 gauge or 16 gauge shotgun shells (16 gauge seems to have only been used on the commercial version) alongside a single 9.3×74mmR rifle round. The M30 has two triggers and a sliding selector directly behind the lever for opening the breech.
On the AKM assault rifle, the brake also angles slightly to the right to counteract the sideways movement of the rifle under recoil. Another simple method is porting, where holes or slots are machined into the barrel near the muzzle to allow the gas to escape. [13] More advanced designs use baffles and expansion chambers to slow escaping gases.
Conversions for rifles and carbines of larger caliber, such as the AK-47 or Thompson submachine gun include a rifled insert barrel extending beyond the length of the chamber. [ 9 ] [ 10 ] One exception to the use of a special lightweight bolt was the Colt Service Ace , offered as a complete pistol or as a conversion kit for the M1911.
The final bore is the FABARM choke system which consists of standard choking followed by a cylinder profile at the muzzle which serves to improve shot patterns and distribution. [3] The muzzle is threaded to accept one of five different chokes or a muzzle brake/compensator. Some models were sold with a ventilated barrel shroud.
The original patent filed by Hermann Gerlich in 1932 [6]. The squeeze bore concept was first patented by German inventor Carl Puff in 1903 [7] [8], even though the general principle was known already in 19th century and later applied in lighter fashion on Armstrong guns, on which only the muzzle yet not the barrel itself was of slightly smaller diameter (to cast off the sealing leather-bag ...
With an open choke, the reduction in diameter is minimal, so accuracy does not suffer much; tighter chokes, however, deform the slug enough to impact accuracy significantly, and the impact of the slug on the choke (at velocities around 450 meters per second (1500 feet per second)) could also stretch the barrel with repeated firings.
Having two barrels lets the shooter use a more open choke for near targets, and a tighter choke for distant targets, [6] providing the optimal shot pattern for each distance. The disadvantage lies in the fact that the barrels of a double-barreled shotgun, whether over-and-under or side-by-side, are not parallel, but slightly angled, [ citation ...