CMMG Parts Kit Bolt Maintenance Mk57 5.7x28mm

Name: CMMG Parts Kit Bolt Maintenance Mk57 5.7x28mm
Brand: CMMG
Availability: InStock

CMMG · Bolt Carrier Group

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Best price

$45.99at OpticsPlanet

In stock Sale checked Oct 13, 2026

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Where to buy

Store	Price	Availability	Buy	Add to build
OpticsPlanet Best price	$45.99Salechecked Oct 13, 2026	In stock	Buy at OpticsPlanet
CMMG	$34.95checked Oct 13, 2026	Check store	Buy at CMMG

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: $45.99 at OpticsPlanet. Dashed line = out of stock. Tracking since Oct 12, 2026.

Show the prices as a table

Store	Latest	Lowest	Highest
CMMG	$34.95	$34.95	$34.95
OpticsPlanet	$45.99	$45.99	$45.99

Since Oct 12, 2026.

About this part

The CMMG Parts Kit Bolt Maintenance Mk57 5.7x28mm is a bolt carrier group from CMMG. It's sold by 2 stores (1 in stock), from $34.95 to $45.99. The lowest in-stock price in the last 30 days was $45.99 at OpticsPlanet.

Specifications

Manufacturer: CMMG

From the manufacturer

CMMG Parts Kit Bolt Maintenance Mk57 5.7x28mm. 728) Bolt. Specifications for CMMG Mk57 5.7x28mm Bolt Maintenance Kit: Manufacturer: CMMG Caliber: 5.7x28mm Gun Make: CMMG Package Contents: CMMG Mk57 5.7x28mm Bolt Maintenance Kit Mk57 (5.728) Extractor Extractor Spring Extractor Pin 1-16? Roll Pin Extractor Buffer Mk57 (5.728) Ejector Bolt Spring Ejector Spring CMMG 57AFF37: Parts Kit Bolt Maintenance Mk57 5.7x28mm