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Carbine
Close Quarter Battle Receiver[1]
Top: An M4A1 with SOPMOD Block 1 package, including Rail Interface System and Trijicon 4× ACOG. The barrel length is 14.5 inches (368 mm). Bottom: An M4A1 with a Close Quarter Battle Receiver. The barrel length is 10.3 inches (262 mm).
Type
Carbine
Place of origin
United States
Service history
In service
2000–present
Used by
See M4 Carbine users
Wars
War in Afghanistan Iraq War
Production history
Designer
Colt Defense, Daniel Defense.[2]
Designed
1999[citation needed]
Produced
2000–present[citation needed]
No. built
Approx. >10,000
Specifications (CQBR)
Mass
2.72 kg (6.00 lb)
Length
762 mm (30.0 in) stock extended 679.4 mm (26.75 in) stock collapsed
Barrel length
262 mm (10.3 in)
Cartridge
5.56×45mm NATO
Action
Gas-operated, rotating bolt
Rate of fire
700–950 round/min cyclic
Muzzle velocity
2,585 ft/s (788 m/s)[3]
Effective firing range
300 m (328 yd)
Feed system
20- or 30-round detachable STANAG magazine
Sights
Iron sights and various SOPMOD sights
The Close Quarter Battle Receiver (CQBR) 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 overall length of the upper receiver is 19.25 inches (489 mm). With the stock collapsed, the overall length of the weapon is 26.75 inches (679.4 mm). Those created as complete rifles (rather than only upper receivers) are type designated as Mk 18 MOD 0/1.
Special forces units utilize the CQBR for scenarios such as VIP protection, urban warfare, and other close quarters battle (CQB) situations.
Its former preliminary National Stock Number (NSN) had been 1005-LL-L99-5996. A complete CQBR-equipped carbine now has the NSN 1005-01-527-2288.
^"NSWC CRANE SAVES $970K FOR NAVSEA SMALL ARMS OFFICE" (PDF). Defense Acquisition University. US Navy. 22 August 2008. pp. 85–86. Archived from the original (PDF) on 22 June 2022. Retrieved 22 June 2022.
^"MK18". Daniel Defense. Archived from the original on 14 April 2021.
^Johnson, Jeff (14 May 2003). "– CQB Receiver – M4A1 Carbine with 10-Inch Upper Receiver". NDIA. 2003 Joint Services Small Arms Section Annual Symposium, Exhibition, Firing Demonstration & Plant tour: NSWC. Archived from the original on 22 June 2022. Retrieved 22 June 2022.{{cite web}}: CS1 maint: location (link)
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