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The standard M4 Type Carbine features a permanently fixed "Izzy" flash suppressor attached to a 14.5 in (370 mm) barrel, which brings the barrel to a total length of 16 in (410 mm). Bushmaster also produces the Patrolman's Carbine variant which features the more common removable "bird cage" flash suppressor, attached to a 16 in (410 mm) barrel ...
Government-specified barrel profile increased to between 0.675 and 0.575 inches; A2: Also referred to as the "government" or "gov't" profile. Barrel profile for which the portion of the barrel in front of handguards is thickened to 0.715 inches; HBAR: A barrel that in some portion is thicker than government-profile, usually underneath the ...
These calibers are designed to be interoperable with the 5.56 by maintaining similar dimensions, which allows them to be used in a 5.56-chambered rifle with a simple barrel change. By late 2004, the 6.8mm Remington SPC (6.8×43mm) was in limited use with U.S. Special Operators.
All SIG516 models except the Marksman are equipped with 16-inch (406 mm) barrels shrouded by a free-floating M1913 Picatinny rail, as well as flip-up iron sights made by SIG Sauer. [ 4 ] The 5.56×45mm NATO SIG516 models accept STANAG box magazines .
Bushmaster Dissipator Model XM-15 rifle with aftermarket handguards The Bushmaster XM-15 used by the D.C. snipers during their attacks in October 2002. The Bushmaster XM-15 series (or XM15 [3]) is a line of AR-15 style semi-automatic rifles and carbines manufactured by Bushmaster Firearms International, LLC. [2]
The AOR is available in two variants; the M21-5 which uses the 5.56×45mm NATO round, and the M21-7 which uses the 7.62×51mm NATO. [4] [5]There are four sub-variants for the M21-5:
Remington R4 ; Type: Assault rifle Semi-automatic rifle Carbine: Place of origin: United States: Service history; In service: 2012–present: Wars: ISIL insurgency in the Philippines
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.