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The M4 bayonet, like the M3 fighting knife that preceded it, was designed for rapid production using a minimum of strategic metals and machine processes, it used a relatively narrow 6.75 in (17.1 cm) bayonet-style spear-point blade with a sharpened 3.5 in (8.9 cm) secondary edge. [1]
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.
U.S. Marines with OKC-3S bayonets fixed to their M16A4 rifles during the Second Battle of Fallujah, November 2004.. The OKC-3S is part of a series of weapon improvements begun in 2001 by Commandant of the Marine Corps James L. Jones to expand and toughen hand-to-hand combat training for Marines, including training in the Marine Corps Martial Arts Program and knife fighting.
The Better Business Bureau (BBB) is an American private, 501(c)(6) nonprofit organization founded in 1912. BBB's self-described mission is to focus on advancing marketplace trust, [2] consisting of 92 independently incorporated local BBB organizations in the United States and Canada, coordinated under the International Association of Better Business Bureaus (IABBB) in Arlington, Virginia.
The M3 knife and all of these bayonets fit in the M8A1 scabbard, officially designated as the "Scabbard, Bayonet Knife, M8A1," with the National Stock Number (NSN) 1095-00-508-0339. Other fighting knives used by U.S. forces have sometimes been referred to as trench knives.
The Army has purchased 600 of the latest version the M4 with first deliveries received in 2021. [30] [31] The M4 will be rolled out over five years. An M3 will be replaced when it reaches its ten year life span. [30] The Army has yet to procure a fire control system for the M4. [30] The M2 version will be retained for training. [30]
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There is also a military M4 Type Carbine which comes with a 14.5 in (370 mm) barrel and a removable "bird cage" flash suppressor. [5] An M4 Type Post-Ban Carbine was developed for the 1994 United States Federal Assault Weapons Ban requirements. Since the ban expired in 2004, this rifle has essentially been replaced by the M4A2 and M4A3.