CMMG Parts Kit Complete BCG Repair Mk57 5.7x28mm

Name: CMMG Parts Kit Complete BCG Repair Mk57 5.7x28mm
Brand: CMMG

CMMG · Bolt Carrier Group

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Best price

$169.95at CMMG

checked Oct 22, 2026

Buy at CMMG

Compare 3 stores

Where to buy

Store	Price	Availability	Buy
CMMG Best price	$169.95checked Oct 22, 2026	Check store	Buy at CMMG
OpticsPlanet	$153.99Salechecked Oct 22, 2026	Out of stock	Buy at OpticsPlanet
Brownells	$163.08checked Oct 22, 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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Dashed line = out of stock. Tracking since Oct 18, 2026.

Show the prices as a table

Store	Latest	Lowest	Highest
Brownells	$163.08	$163.08	$163.08
CMMG	$169.95	$169.95	$169.95
OpticsPlanet	$153.99	$153.99	$153.99

Since Oct 18, 2026.

About this part

The CMMG Parts Kit Complete BCG Repair Mk57 5.7x28mm is a bolt carrier group from CMMG. It's sold by 3 stores, from $153.99 to $169.95.

Specifications

Manufacturer: CMMG

From the manufacturer

CMMG Parts Kit Complete BCG Repair Mk57 5.7x28mm. 728. Specifications for CMMG Mk57 5.7x28mm Complete BCG Repair Kit: Manufacturer: CMMG Caliber: 5.7x28mm Gun Make: CMMG Package Contents: CMMG Mk57 5.7x28mm Complete BCG Repair Kit Bolt 5.7x28mm Firing Pin Firing Pin Retainer Pin Key (RDB) Key Screw X 2 Bolt Cam Pin Extractor Extractor Buffer & Spring Ejector Ejector Spring Bolt Spring (RDB) Roll Pins CMMG 57AFF82: Parts Kit Complete BCG Repair Mk57 5.7x28mm