308ar Bolt Carrier Group Mk3

Name: 308ar Bolt Carrier Group Mk3
Brand: CMMG
Availability: InStock

CMMG · Bolt Carrier Group

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Best price

$258.49at OpticsPlanet

In stock Sale Lowest in 30 dayschecked Nov 13, 2026

Buy at OpticsPlanet

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Fits and works with

Caliber: .308 / 7.62x51 · Shop matching ammo
Bolt: AR-10 (.308 / 6.5 CM) · Bolt carrier groups

Specifications

Manufacturer: CMMG
Color: Black
Platform: AR-10
Caliber: .308 / 7.62
Material: Steel

Where to buy

Store	Price	Availability	Buy
OpticsPlanet Best price	$258.49Salechecked Nov 13, 2026	In stock	Buy at OpticsPlanet
Ammunition Depot	$266.49checked Nov 13, 2026	In stock	Buy at Ammunition Depot
Classic Firearms	$255.40checked Nov 13, 2026	Check store	Buy at Classic Firearms
GrabAGun	$259.99Salechecked Nov 13, 2026	Check store	Buy at GrabAGun
Palmetto State Armory	$272.99checked Nov 13, 2026	Check store	Buy at Palmetto State Armory
Brownells 17.76% off · ends Nov 15 · exclusions apply	$301.54checked Nov 13, 2026	Out of stock	Buy at Brownells

Prices and availability change often, so confirm on the store's site before you buy. We may earn a commission from these links.

Price history

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Lowest in-stock price in the last 30 days: $258.49 at OpticsPlanet. Dashed line = out of stock. Tracking since Sep 28, 2026.

Show the prices as a table

Store	Latest	Lowest	Highest
Ammunition Depot	$266.49	$266.49	$324.99
Brownells	$301.54	$301.54	$301.54
Classic Firearms	$255.40	$255.40	$255.40
GrabAGun	$259.99	$259.99	$259.99
OpticsPlanet	$258.49	$258.49	$265.49
Palmetto State Armory	$272.99	$272.99	$272.99

Since Sep 28, 2026.

About this part

The 308ar Bolt Carrier Group Mk3 is a .308 / 7.62x51 bolt carrier group from CMMG. It's sold by 6 stores (2 in stock), from $255.40 to $301.54. The lowest in-stock price in the last 30 days was $258.49 at OpticsPlanet.

From the manufacturer

Complete bolt/carrier group is ready to drop into your AR-style .308 rifle and run hard. Machined of 8620 steel, carrier has a durable phosphate finish and chrome lined interior. Carrier does not have serrations for a forward assist. Bolt is machined from 9310 hardened steel with an extractor of hardened S7 tool steel and a phosphate finish. Gas key has been torqued to spec and properly staked. Firing pin is machined from stainless steel. Group also includes cam pin and firing pin retaining pin. Mfg: Cmmg SPECS: Carrier - 8620 steel, chrome lined, phosphate finish, matte black. Bolt - 9310 steel, phosphate finish. Extractor - S7 tool steel, phosphate finish. Firing Pin - Stainless steel.