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The shorter 14.5-inch (37 cm) barrel of the M4 carbine (with a STANAG 4172 conform 1:7 twist and M855/SS109 5.56 rounds^) generates significantly lower muzzle velocity, reducing the likelihood that the bullet will upset (yaw, fragment, or expand) in the target and resulting in less significant wounds.
The standard AR-15 rifle uses a 20-inch (510 mm) barrel. Although, both shorter 16-inch (410 mm) carbine barrels and longer 24-inch (610 mm) target barrels are also available. Early models had barrels with a 1:12 rate of twist for the original .223 Remington, 55-grain (3.6 g) bullets. Current models have barrels with a 1:9 or 1:7 twist rate for ...
The 7.62×39mm has ballistics similar to the well-known .30-30 Winchester. [24] The Mini Thirty is available with a 16.12" (Tactical Model) or 18.50" barrel having a twist rate of 1:10" RH, and is sold with two 20-round or 5-round box magazines. [25] Ruger does not currently produce 30-round Mini Thirty magazines.
The rifle itself is offered in two variants: the S-5.56 A1 with a 19.9-inch barrel and 1:12 pitch rifling (1 turn in 305 mm), optimized for the use of the M193 Ball cartridge; and the S-5.56 A3 with a 20-inch barrel and a 1:7 pitch rifling (1 turn in 177, 8 mm), optimized for the use of the SS109 cartridge. [216]
Barrel length Barrel profile Barrel twist Bayonet Lug Muzzle device M16 PIP: A2 Ribbed S-1-F, S-1-3 A2 Yes Yes 5.56 NATO 20 in. A2 1:7 Yes A1 or A2 Colt Advanced Combat Rifle: Retractable ACR ACR Type S-1-3 or S-1-F Flattop Yes Yes 5.56 NATO 20 in. A2 1:7 No ACR compensator M231 FPW: FPW Wire Short Round S-F None No No .223 REM 15.6 in. HBAR 1: ...
CZ 527 with 24 inch barrel, and rifle scope. Type: Rifle: Place of origin: ... The 1:9 barrel twist in the Varmint Kevlar reduces muzzle velocities by about 1.5% ...
An 88 by 10 inch (224 x 25 cm) 5.56mm Microgun Pod was also developed for external use on light aircraft and helicopters. The unit had an ammunition capacity of 1,500 to 3,500 rounds and a loaded weight of 186 to 300 pounds (84 to 136 kg).
SR-25 barrels were originally manufactured by Remington Arms with its 5R (five grooves, right twist) rifling, with twist 1:11.25. The heavy 24-inch (610 mm) barrel is free-floating , so handguards are attached to the front of the receiver and do not touch the barrel.