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R5 RGP (Remington Gas Piston) is a carbine that was designed and manufactured by Remington Arms. [4] [5] It is an AR-15 type rifle which uses a unique mid-length gas piston operating system in an attempt to improve the reliability of the weapon, [6] [better source needed] and featured a monolithic upper, as the upper receiver and handguard were machined as a single piece.
The standard XM-15 has a forged 7075T6 aircraft-grade aluminum upper and lower receiver. Barrels of XM-15 firearms have a heavy profile and are hard chrome-lined 4150 alloy steel or 416 stainless steel. [2] [4] In Bushmaster's 2016 sales brochure, all new-production XM-15s are stated to be supplied with a 4150 steel barrel. [5]
At the SHOT Show in January 2023, IWI revealed a variant for the U.S. civilian market, with a 16" barrel and a M-LOK handguard replacing the original MIL-STD 1913 handguard. [5] [6] The overall length measures 37.25 inches (stock fully extended) and weighs 8 lb 2 oz unloaded. [7] MSRP for the rifle is US$1,799.
Barrel length: R4 Patrol/Operator/Enhanced: 11.5 in (290 mm) ... The Remington R4 is a firearms platform based on the AR-15/M16/M4/M4A1 series designed and ...
HBAR: A barrel that in some portion is thicker than government-profile, usually underneath the handguards; M4: Government barrel profile with small portion reduced to 0.575 inches to mount M203 grenade launcher; M4 HBAR: M4 barrel with portion under handguard thickened for sustained automatic fire; Super Heavy: Special Colt bull target/match barrel
The M4 carbine barrel is 368 mm (14.5 in) and the XM8 barrel is 317 mm (12.5 in) but the rifles have the same overall length. Although a shorter barrel generally results in lower muzzle velocity, Polygonal rifling partially compensates for the loss of velocity from a shorter barrel. An electronic round counter was proposed for the XM8.