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The REC7 rifle's forged 7075 aluminum upper and lower receivers are Type 3 hardcoat anodized. The lower houses an ultra-dependable single-stage trigger. The upper supports a free-floated, hammer-forged, chrome-lined barrel with M4 feed ramps machined into the receiver and the barrel extension. A mil-spec A2 flash hider protects the muzzle. [3 ...
The weapon has a suppression-ready fluted barrel, which is lighter and cools better than previous M4 barrels. It is claimed to have "markedly better" accuracy. To improve reliability, Colt used an articulating link piston (ALP), which "reduces the inherent stress in the piston stroke by allowing for deflection and thermal expansion". [ 51 ]
The M4 was developed from the Harrington & Richardson bolt-action M265 sporting rifle, adapted to a sheet metal frame with telescoping wire buttstock, a 14-inch detachable barrel chambered for .22 Hornet and the 4-shot detachable box magazine of the Savage Stevens M23D .22 Hornet sporting rifle.
Rear side of a CZ-75B pistol barrel showing the (here dirty) feed ramp. Locking lug feed ramp on AR-15 barrel nut. A feed ramp is a basic feature of many breech loading cartridge firearm designs. It is a tightly machined and polished piece of metal which guides a cartridge from the top of the magazine into the firing chamber of the barrel.
The WLVRN is a multi caliber gas operated, conventional rotary bolt bullpup rifle. The gas system features a gas piston located above the barrel and a 6 position manual gas regulator The WLVRN is similar to the Desert Tech MDRx Rifle that it replaced when launched in January 2024. The WLVRN's specific improvements over the MDRx include a ...
Bushmaster Firearms originally produced their 'First Generation' rifle using an aluminum lower receiver and a stamped steel upper receiver. This first-generation model used a long-stroke gas piston operating system. The recoil spring was within the upper barrel gas system compared to the AR-15/M-16, where the recoil spring is within the butt stock.
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The Close Quarter Battle Receiver (CQBR) [5] is a replacement upper receiver for the M4A1 carbine developed by the US Navy.. The CQBR features a 10.3 in (262 mm) length barrel (similar to the Colt Commando short-barreled M16 variants of the past) which makes the weapon significantly more compact, thus making it easier to use in, and around, vehicles and in tight, confined spaces.