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Bolt Carrier Groups

CMMG M16 Bolt Carrier Group for AR15 5.56 NATO – 8620 Carrier, 9310 Bolt, Black (55BA419)

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CMMG M16 Bolt Carrier Group for AR15 5.56 NATO – 8620 Carrier, 9310 Bolt, Black (55BA419)

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Why customers choose this item

  • M16 bolt carrier group
  • Chambered 556 NATO caliber
  • 8620 steel carrier material
  • 9310 steel bolt assembly
  • Phosphate finish coating
  • Complete BCG assembly

Product highlights

  • Complete M16 bolt carrier group chambered for 5.56 NATO rifle platforms
  • Carrier constructed from 8620 steel for durability and consistent performance
  • Bolt manufactured from 9310 steel for strength and extended service life
  • Phosphate finish provides corrosion resistance and reduced surface wear
  • Designed to meet mil-spec standards for AR-15 and M16 compatibility
  • Includes fully assembled bolt carrier group ready for installation

Product description

The CMMG Bolt Carrier Group M16 556NATO Black is a bolt carrier group designed for AR-style rifles chambered in 5.56 NATO. This bolt carrier group is configured for M16 pattern systems and functions as a complete internal cycling assembly. It is designed to operate within compatible upper receivers for standard firing sequences.

The CMMG M16 bolt carrier group includes an 8620 steel carrier and a 9310 steel bolt with a phosphate finish. It is categorized as a complete bolt carrier group for AR-platform rifles and is finished in black. This product is used for assembling or replacing internal rifle components for range use or field configurations. In normal operation, the bolt carrier group cycles within the upper receiver to chamber, fire, and extract cartridges during use.

Specifications

Brand
CMMG
Model / Series
55BA419
MPN (Manufacturer Part #)
55BA419
UPC
852005002431
Item Type (leaf)
Bolt Carrier Groups
Pack Quantity
1
Weight
11.6 oz
Primary Use / Application
Bolt Carrier Upgrade
Platform Compatibility
M16 / AR-15
Caliber Compatibility
5.56 NATO
Material
8620/9310 Steel
Finish / Coating
Phosphate
Bolt Type
Mil Spec M16 BCG
Included Components
BCG

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CMMG M16 Bolt Carrier Group for AR15 5.56 NATO – 8620 Carrier, 9310 Bolt, Black (55BA419)
CMMG M16 Bolt Carrier Group for AR15 5.56 NATO – 8620 Carrier, 9310 Bolt, Black (55BA419)
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CMMG MK3 Bolt Carrier Group for 308 Win – 8620 Carrier, 9310 Bolt, Black Finish (38BA423)
CMMG MK3 Bolt Carrier Group for 308 Win – 8620 Carrier, 9310 Bolt, Black Finish (38BA423)
Price$180.48$201.34$296.71
Primary Use / ApplicationBolt Carrier UpgradeCycle ActionBolt Carrier Upgrade
Platform CompatibilityM16 / AR-15AR-15Mk3
Material8620/9310 SteelSteel8620/9310 Steel
Finish / CoatingPhosphateBlackPhosphate
Caliber Compatibility5.56 NATO—.308 Win
Configuration———

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