Close Quarters Battle Receiver vs Remington Model 870

See Users^[source]Remington Model 870 · Used by

War in Afghanistan Iraq War^[source]

Vietnam War Rhodesian Bush War Lebanese Civil War War in Afghanistan Iraq War^[source]Remington Model 870 · Wars

Colt Defense Daniel Defense^[source]

L.Ray Crittendon, Phillip Haskell, Ellis Hailston, G.E. Pinckney^[source]Remington Model 870 · Designer

1999^[source]

1950^[source]Remington Model 870 · Designed

2000–present^[source]

1951–present^[source]Remington Model 870 · Produced

10,000+^[source]

11,000,000+^[source]Remington Model 870 · No. built

5.56×45mm NATO^[source]

12 gauge , 16 gauge , 20 gauge , 28 gauge , or .410 bore^[source]Remington Model 870 · Cartridge

12-gauge^[source]Remington 870 · FieldMaster Deer

.410-bore^[source]Remington 870 · 410 Turkey TSS

12-gauge^[source]Remington 870 · Turkey Camo

12-gauge^[source]Remington 870 · SPS Superslug

12-gauge, 20-gauge^[source]Remington 870 · Fieldmaster

12-gauge, 20-gauge^[source]Remington 870 · Fieldmaster Synthetic

12-gauge^[source]Remington 870 · Special Purpose Marine Magnum

12-gauge ( 2 + 3 ⁄ 4 ", 3" and 3 + 1 ⁄ 2 ")^[source]Remington 870 · SPS Super Mag Turkey Predator

12-gauge ( 2 + 3 ⁄ 4 ", 3" and 3 + 1 ⁄ 2 ")^[source]Remington 870 · Super Magnum Flyaway

12-gauge ( 2 + 3 ⁄ 4 ", 3" and 3 + 1 ⁄ 2 ")^[source]Remington 870 · Super Magnum Turkey/Waterfowl Camo

12-gauge ( 2 + 3 ⁄ 4 " and 3"), 20-gauge, and .410-bore^[source]Remington 870 · Wingmaster

12-gauge^[source]Remington 870 · Fieldmaster Fully Rifled Cantilever

Gas-operated , closed rotating bolt , Stoner bolt and carrier piston^[source]

Pump-action^[source]Remington Model 870 · Action

700–950 round/min cyclic^[source]

20- or 30-round detachable STANAG magazine^[source]

3+1, 4+1, 5+1, 6+1, or 7+1 round internal tube magazine , or an external 6+1 box magazine^[source]Remington Model 870 · Feed system

Iron sights and various SOPMOD sights^[source]

Bead, twin bead, adjustable open sights, or ghost ring (all iron sights ). Also cantilever and receiver-mounts for scopes^[source]Remington Model 870 · Sights

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.^[source]

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.^[source]

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.^[source]

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.^[source]

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 .^[source]

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）^[source]

Remington Arms^[source]Remington Model 870 · Manufacturer

$ 350^[source]Remington Model 870 · Unit cost

See Variants^[source]Remington Model 870 · Variants

Fully rifled^[source]Remington 870 · FieldMaster Deer

Vent Rib, Rem Choke^[source]Remington 870 · 410 Turkey TSS

Vent Rib, Rem Choke^[source]Remington 870 · Turkey Camo

Fully rifled extra heavy (fluted)^[source]Remington 870 · SPS Superslug

Vent rib Rem Choke and fully rifled^[source]Remington 870 · Fieldmaster

Vent rib Rem Choke and fully rifled^[source]Remington 870 · Fieldmaster Synthetic

Cylinder choke^[source]Remington 870 · Special Purpose Marine Magnum

Rem Choke^[source]Remington 870 · SPS Super Mag Turkey Predator

Vent rib, Rem Choke^[source]Remington 870 · Super Magnum Flyaway

Vent rib, Rem Choke^[source]Remington 870 · Super Magnum Turkey/Waterfowl Camo

Vent Rib, Rem Choke^[source]Remington 870 · Wingmaster

Fully rifled^[source]Remington 870 · Fieldmaster Fully Rifled Cantilever