M16 Bolt Carrier Group 5.56X45mm Nickel Boron MP

Best price

$109.99at Brownells

checked Sep 30, 2026

Buy at Brownells

Where to buy

Store	Price	Availability	Buy	Add to build
Brownells	$109.99checked Sep 30, 2026	Check store	Buy at Brownells

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About this part

The M16 Bolt Carrier Group 5.56X45mm Nickel Boron MP is a 5.56 / .223 bolt carrier group from Brownells. One store lists it, Brownells at $109.99.

Fits and works with

Caliber: 5.56 / .223 · Shop matching ammo
Bolt: Standard AR-15 (5.56 / 300 BLK / .350 Legend) · Bolt carrier groups

Specifications

Manufacturer: Brownells
Platform: AR-15
Caliber: 5.56 mm NATO

From the manufacturer

Flawless Operation at an Affordable Price

The Brownells M16 5.56 Complete Bolt Carrier Group is an affordable option that is built and tested to provide flawless operation in any AR-15 or M16.

The Brownells M16 5.56 Complete Bolt Carrier Group features a bolt fabricated from 9310 steel that includes a heat-treated and shot-peened finish. The bolt carrier itself is built using 8620 steel, which features a hardened finish. The whole BCG is completed with a nickel-boron coating.

Steel quality assured with magnetic particle inspection
Features extractor with rubber insert and spring
Gas-key screws are torqued and staked
Designed for use with all 5.56-NATO-based cartridge cases.

The Brownells M16 5.56 Complete Bolt Carrier Group features a full assembly that includes the bolt, bolt carrier, gas key, firing pin, cam pin and a firing pin retaining pin.