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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.
11.5" barrel with carbine-length gas system. Its smaller size allows for easier stowing for transport, and less cumbersome to carry. With nearly 100% compatibility with other KS series rifles, it is the recommended choice for a secondary upper receiver for those with KS-1 or KS-2 rifles, or as a primary system for those that require a ...
The SOPMOD kit is composed mostly of non-developmental items and commercial off-the-shelf (NDI/COTS) accessories packaged together to support four M4A1 carbines. [ 1 ] [ 3 ] It allows for the attachment of any Picatinny compatible accessory that fits the length of the weapon.
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". Primarily intended for barrel lengths from 9" to 10". Micro Upper Receivers – 13.25" long and designed to support barrel lengths from 7.5" to 18.6".
A disassembled Mauser action showing a partially disassembled receiver and bolt. In firearms terminology and 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 ...
Colt M4 Carbines and Colt M4A1 Carbines can be easily and relatively inexpensively modified/upgraded into ACC-Ms by replacing the upper receiver, which is more cost-effective than completely replacing the weapons with a whole new carbine with a different control layout and different overall ergonomics and handling characteristics that require ...
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 Armada is a select-fire rifle composed of two receivers (upper and lower) manufactured in forged aluminum, uses a 22 in (560 mm) barrel with a 1:9 right-hand twist (able to stabilize both M193 "Ball" and SS109/M855 variants of the 5.56mm cartridge), Norinco CQ-style plastic parts (grip, stock, handguard), flip-up rear sight adjustable for ...