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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.
A disassembled Mauser action showing a partially disassembled receiver and bolt. In firearms terminology and at law, the firearm frame or receiver is the part of a firearm which integrates other components by providing housing for internal action components such as the hammer, bolt or breechblock, firing pin and extractor, and has threaded interfaces for externally attaching ("receiving ...
In August 2009 Robinson Arms began shipping 3 different sized upper receivers enabling PDW and pistol style variants: [11] Standard Upper Receiver – The original length and designed to support barrel lengths from 11" to 18.6". Mini Upper Receivers – 15.25" long and designed to support barrel lengths from 9" to 18.6".
The IAR6940 is marginally heavier than the IAR6940H at 10.1 lb (4.6 kg) compared to the latter at 9.28 lb (4.21 kg), with the main reason being that the IAR6940 sported a monolithic upper receiver while the IAR6940H used a lighter Knight's Armament Handguard. [5] Colt submitted the two variants as contenders for to the IAR program.
The AR-57 PDW upper is a new design on AR-15/M16 rifles, blending the AR-15/M16 lower with a lightweight, monolithic upper receiver system chambered in 5.7×28mm. This model is also sold as a complete rifle, supplied with two 50-round P90 magazines. [1]
The .50 Beowulf (12.7x42mmRB) is a 12mm caliber rifle cartridge developed by Bill Alexander of Alexander Arms for use in an AR-15 rifle. [ 1 ] Design and specifications
ArmaLite AR-15 with the charging handle located on top of the upper receiver, protected within the carrying handle and a 25-round magazine. 1973 Colt AR-15 SP1 rifle with "slab side" lower receiver (lacking raised boss around magazine release button) and original Colt 20-round magazine.
The Monolithic Rail Platform (MRP) [3] was created by the company, a one-piece, Picatinny-topped AR-15-pattern upper receiver made from a forged aluminum block. [4] The MRP upper receiver has a quick-change barrel system. [5] Its top rail position matches M4 and E3-type weapons for optical and sight compatibility. [6]