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The AR-10 is slightly larger and heavier than the AR-15. It was originally designed to chamber the military 7.62x51 NATO cartridge (also .308), which has a COAL of 2.800" (71.12mm) 45 Raptor , uses the standard 7.62 NATO case, cut to a length of 1.800" from 2.015", resulting in a straight-wall cartridge, neck is sized to 0.452".
AR-15s are modular firearms, and maker's marks are usually applied to the lower receiver, which houses the trigger group. A person with an AR-15 lower receiver can assemble a complete firearm using widely available, commercial and unregulated components, such as barrels, stocks, and upper receivers. [2]
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.
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]
In October 2019, NSWC Crane ordered KAC's self-termed M110K1 conversion kits to upgrade USSOCOM's M110s to fire 6.5mm Creedmoor, with 14.5-inch (370 mm) and 22-inch (560 mm) barreled configurations. These conversion kits included complete upper receiver assemblies chambered for 6.5 Creedmoor as well as new muzzle brakes, and B5 Systems ...
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AR-15A2 Sporter II (Special export model in .222 Remington) A2 Ribbed S-1 A2 Yes No .222 REM 20 in. A2 1:14 Yes A2 R6520 AR-15A2 Government Carbine 3rd Generation Short Ribbed S-1 A2 Yes Yes 5.56 NATO 16 in. A1 1:7 Yes A2 R6521 Colt Carbine (AR-15A2 Government Carbine) (Special export model with receiver block and large pin upper receiver)
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