CMMG Barrel and BCG Kit 8in 4140CM SBN 40 S&W

Name: CMMG Barrel and BCG Kit 8in 4140CM SBN 40 S&W
Brand: CMMG

CMMG · Barrels

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Best price

$474.95at CMMG

checked Oct 22, 2026

Buy at CMMG

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Where to buy

Store	Price	Availability	Buy	Add to build
CMMG Best price	$474.95checked Oct 22, 2026	Check store	Buy at CMMG
OpticsPlanet	$409.99Salechecked Oct 22, 2026	Out of stock	Buy at OpticsPlanet

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 17, 2026.

Show the prices as a table

Store	Latest	Lowest	Highest
CMMG	$474.95	$474.95	$474.95
OpticsPlanet	$409.99	$409.99	$409.99

Since Oct 17, 2026.

About this part

The CMMG Barrel and BCG Kit 8in 4140CM SBN 40 S&W is an 8" barrel from CMMG. It's sold by 2 stores, from $409.99 to $474.95.

Fits and works with

Barrel length: 8" · Handguards

Specifications

Manufacturer: CMMG
Barrel length: 8"

From the manufacturer

CMMG Barrel and BCG Kit 8in 4140CM SBN 40 S&W. Unlike typical direct blowback systems our RDB uses a bolt that is forced to rotate and unlock slowing the BCG. This results in a lighter BCG for a lighter pistol or rifle and less felt recoil than a straight blowback system. Specifications for CMMG .40 S&W Barrel And Bcg Kit: Manufacturer: CMMG Finish: No Fabric/Material: 4140 Steel Caliber: .40 S&W Barrel Profile: Medium Tapered Barrel Twist Rate: 1-16 Flutes: No Gun Make: CMMG Weight: 1.4 lb Firearms Threads Per Inch: .578x28 Package Contents: CMMG .40 S&W Barrel And Bcg Kit CMMG 40D732D: Barrel and BCG Kit 8in 4140CM SBN 40 S&W