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Programme

Wars: War in Afghanistan Iraq War¹
Designer: Colt Defense Daniel Defense¹
Designed: 1999¹
Produced: 2000–present¹
No. built: 10,000+¹
Upper and lower receivers: The lower receiver is a standard M4A1 lower receiver, sometimes modified with the addition of a CQD RSM sling adapter plate. However, many CQBR rifles also use surplus M16A1 lower receivers. Internally, the CQBR also takes advantage of a larger gas port and modified bolt carrier and buffer assembly. The gas port has been opened to 0.070 in (1.8 mm). A number of Lewis Machine & Tool 10.5" (266.7 mm) upper receivers have also been reported to have been purchased for the CQBR program. These upper receivers feature a gas system optimized for short barrel use. The MOD 1 makes use of a forward sight delete and full-length handguard to provide more rail space for the user.¹
Stock: A variety of M4 retractable buttstocks are used on a standard 4-position receiver extension, including the standard "CAR" stock. The SOPMOD stock, often referred to as the "Crane stock", created by Dave Armstrong of NSWC-Crane is commonly used. The angled stock offers better cheekweld and provides two storage compartments for spare batteries. The stock must be removed from the weapon to access the storage compartments. The initial run of stocks was made by NSWC-Crane from glass fiber polymer. Because of this, they were somewhat fragile and did not always properly lock into the receiver extension. A rubber band was used to secure the latch so it would not slide out of the desired position. The current L7LA2B SOPMOD stocks are made by Lewis Machine & Tools and have none of these problems.¹
Barrel: The CQBR uses a 1:7 in (178 mm) twist M4 barrel that has been modified in length to 10.3 in (262 mm). The diameter of the barrel under the handguards is 1.17 in (29.7 mm). The KAC M4-QD flash suppressor is fitted, allowing use of the KAC QDSS-NT4 suppressor ( National Stock Number 1005-01-437-0324). Although it has a bayonet lug, the CQBR is not meant to be fitted with a bayonet.¹
Handguards: The standard handguard for the CQBR is the Knight's Armament Company Rail Interface System (M4 Carbine RIS; National Stock Number 1005-01-416-1089), which is designed for a variety of barrel profiles and allows for the use of any MIL-STD-1913 tactical accessories such as the AN/PEQ-2 , AN/PEQ-15 , SureFire flashlights, or a vertical forward grip . MOD 1/Block II changes incorporated the Daniel Defense's MK18 RIS, NSN # 1005-01-548-1385. The current standard handguard on URG-I improved variants is a Geissele Automatics M-LOK railed system for greater compatibility with modern accessory mounting solutions at a lighter weight than previous iterations.¹
Ammunition: The CQBR is designed to use standard 5.56×45mm NATO 62-grain SS109/M855 FMJ and M856 Tracer ammunition. However, due to the short barrel, the heavier 77-grain Mk 262 cartridge is preferred. There are no plans to rechamber the weapon in any additional calibers .¹

Sources & original excerpts2 references

Close Quarters Battle Receiver · Wikipedia revision 1364218469 ↗
Type
Infobox · Type
Carbine
Place of origin
Infobox · Place of origin
United States
In service
Infobox · In service
2000–present
Used by
Infobox · Used by
See M4 Carbine users
Wars
Infobox · Wars
War in Afghanistan Iraq War
Designer
Infobox · Designer
Colt Defense Daniel Defense
Designed
Infobox · Designed
1999
Produced
Infobox · Produced
2000–present
No. built
Infobox · No. built
10,000+
Mass
Infobox · Mass
2.72 kg (6.00 lb)
Length
Infobox · Length
762 mm (30.0 in) stock extended 679.4 mm (26.75 in) stock collapsed
Barrel length
Infobox · Barrel length
262 mm (10.3 in)
Cartridge
Infobox · Cartridge
5.56×45mm NATO
Action
Infobox · Action
Gas-operated , closed rotating bolt , Stoner bolt and carrier piston
Rate of fire
Infobox · Rate of fire
700–950 round/min cyclic
Muzzle velocity
Infobox · Muzzle velocity
2,585 ft/s (788 m/s)
Effective firing range
Infobox · Effective firing range
300 m (328 yd)
Feed system
Infobox · Feed system
20- or 30-round detachable STANAG magazine
Sights
Infobox · Sights
Iron sights and various SOPMOD sights
Upper and lower receivers
Specifications · Upper and lower receivers
The lower receiver is a standard M4A1 lower receiver, sometimes modified with the addition of a CQD RSM sling adapter plate. However, many CQBR rifles also use surplus M16A1 lower receivers. Internally, the CQBR also takes advantage of a larger gas port and modified bolt carrier and buffer assembly. The gas port has been opened to 0.070 in (1.8 mm). A number of Lewis Machine & Tool 10.5" (266.7 mm) upper receivers have also been reported to have been purchased for the CQBR program. These upper receivers feature a gas system optimized for short barrel use. The MOD 1 makes use of a forward sight delete and full-length handguard to provide more rail space for the user.
Stock
Specifications · Stock
A variety of M4 retractable buttstocks are used on a standard 4-position receiver extension, including the standard "CAR" stock. The SOPMOD stock, often referred to as the "Crane stock", created by Dave Armstrong of NSWC-Crane is commonly used. The angled stock offers better cheekweld and provides two storage compartments for spare batteries. The stock must be removed from the weapon to access the storage compartments. The initial run of stocks was made by NSWC-Crane from glass fiber polymer. Because of this, they were somewhat fragile and did not always properly lock into the receiver extension. A rubber band was used to secure the latch so it would not slide out of the desired position. The current L7LA2B SOPMOD stocks are made by Lewis Machine & Tools and have none of these problems.
Barrel
Specifications · Barrel
The CQBR uses a 1:7 in (178 mm) twist M4 barrel that has been modified in length to 10.3 in (262 mm). The diameter of the barrel under the handguards is 1.17 in (29.7 mm). The KAC M4-QD flash suppressor is fitted, allowing use of the KAC QDSS-NT4 suppressor ( National Stock Number 1005-01-437-0324). Although it has a bayonet lug, the CQBR is not meant to be fitted with a bayonet.
Handguards
Specifications · Handguards
The standard handguard for the CQBR is the Knight's Armament Company Rail Interface System (M4 Carbine RIS; National Stock Number 1005-01-416-1089), which is designed for a variety of barrel profiles and allows for the use of any MIL-STD-1913 tactical accessories such as the AN/PEQ-2 , AN/PEQ-15 , SureFire flashlights, or a vertical forward grip . MOD 1/Block II changes incorporated the Daniel Defense's MK18 RIS, NSN # 1005-01-548-1385. The current standard handguard on URG-I improved variants is a Geissele Automatics M-LOK railed system for greater compatibility with modern accessory mounting solutions at a lighter weight than previous iterations.
Ammunition
Specifications · Ammunition
The CQBR is designed to use standard 5.56×45mm NATO 62-grain SS109/M855 FMJ and M856 Tracer ammunition. However, due to the short barrel, the heavier 77-grain Mk 262 cartridge is preferred. There are no plans to rechamber the weapon in any additional calibers .
Wikipedia contributors ↗
Manufacturer
Infobox · 生产商
生产商美國海軍水上作戰中心克蘭分部（改裝）柯爾特（原裝槍及零件）

Reference text from Wikipedia contributors, used under CC BY-SA 4.0.

Measurement history Earlier and superseded figures

Evidence over time

Points represent sourced observations, including revisions. Revisions on the same effective date are not separate inventory events. Ranges appear in the table and are not plotted as exact points.

Observation / report period	Value	Source	Claim state
28 Sept 2026	0.762 m	Wikipedia contributors	superseded
28 Sept 2026	0.762 m	Wikipedia contributors	superseded
28 Sept 2026	0.762 m	Wikipedia contributors	superseded
28 Sept 2026	0.762 m	Wikipedia contributors	superseded
28 Sept 2026	0.762 m	Wikipedia contributors	superseded
28 Sept 2026	0.762 m	Wikipedia contributors	superseded
28 Sept 2026	0.762 m	Wikipedia contributors	approved

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Close Quarters Battle Receiver

Specifications

Dimensions & mass

Performance

Systems & armament

Programme

Size in context

Evidence over time

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