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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. M16A1 rifle with forward assist, raised boss around ...
The Colt Model 655 M16A1 Special High Profile was essentially a standard A1 rifle with a heavier barrel and a scope bracket that attached to the rifle's carry handle. The Colt Model 656 M16A1 Special Low Profile had a special upper receiver with no carrying handle.
Colt's continued attempts to market the HBAR M16A1 as the Model 621 through the late 1970's without success and only a few dozen were manufactured. Colt's did eventually produce a heavy barrel civilian market semi-automatic AR-15 beginning in the late 1980's based on the M16A2 called the AR-15 HBAR that was a commercial success.
Eugene Morrison Stoner (November 22, 1922 – April 24, 1997) was an American machinist and firearms designer who is most associated with the development of the ArmaLite AR-15 rifle that was redesigned and modified by Colt's Patent Firearm Company for the United States military as the M16 rifle.
H&R also manufactured M16A1 rifles during the Vietnam War and is one of only four manufacturers (along with Colt, Fabrique Nationale, & GM Hydramatic Division) to have ever made an official M16 variant for the U.S. Military. [2] Due to their relative scarcity, all H&R military weapons are considered highly desirable by collectors.
After modifications (most notably, the charging handle was re-located from under the carrying handle like AR-10 to the rear of the receiver), [3] Colt rebranded it the Colt 601, however, it still carried the Armalite markings due to contractual obligations to Armalite/Fairchild Aircraft Co. Colt marketed the redesigned rifle to various military ...
The resulting COAL of 2.300" is only 1.02 mm longer than the maximum COAL for chambering a cartridge in the smaller AR-15; however, the 45 Raptor chamber pressure is allowed to be as high as 62,000 PSI. This means that the stronger AR-10 receiver and bolt carrier group is needed for shooting this cartridge.
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.