CMMG Barrel and BCG Kit 16.1in 4140CM SBN 57 x 28mm
$406.49 at Ammunition Depot · 7 stores
In stock
Best price
$395.99at MidwayUSA
In stock checked Oct 22, 2026
Where to buy
| Store | Price | Availability | Buy | Add to build |
|---|---|---|---|---|
| MidwayUSA Best price | $395.99checked Oct 22, 2026 | In stock | Buy at MidwayUSA | |
| Palmetto State Armory | $437.99checked Sep 29, 2026 | Check store | Buy at Palmetto State Armory | |
| CMMG | $474.95checked Oct 22, 2026 | Check store | Buy at CMMG | |
| OpticsPlanet | $399.99Salechecked 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
Lowest in-stock price in the last 30 days: $395.99 at MidwayUSA. 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 |
| MidwayUSA | $395.99 | $395.99 | $395.99 |
| OpticsPlanet | $399.99 | $399.99 | $399.99 |
Since Oct 17, 2026.
About this part
The CMMG Barrel and BCG Kit 8in 4140CM SBN 57 x 28mm is an 8" AR-15 barrel from CMMG. It's sold by 4 stores (1 in stock), from $395.99 to $474.95. The lowest in-stock price in the last 30 days was $395.99 at MidwayUSA.
Fits and works with
- Barrel length
- 8" · Handguards
Specifications
- Manufacturer
- CMMG
- Platform
- AR-15
- Barrel length
- 8"
From the manufacturer
CMMG Barrel and BCG Kit 8in 4140CM SBN 57 x 28mm. 7x28mm Barrel and BCG Kit allows you to build an AR in 5.7x28mm using CMMGs patented Radial Delayed Blowback operating system. Unlike typical direct blowback systems Radial Delayed Blowback not only reduces the weight in your BCG but it results in less felt recoil than a straight blowback system. CMMGs 5.7x28mm Barrel and Bolt Kits are designed to be assembled into a mil-spec AR15 Upper and work with either a CMMG Mk57 lower receiver or with a standard Mk4/AR-15 lower receiver (when using CMMG 5.7 AR Conversion Magazines). Specifications for CMMG 57 X 28mm Barrel And Bcg Kit: Manufacturer: CMMG Color: Black Finish: No Fabric/Material: 4140CM Caliber: 5.7x28mm Flutes: No Condition: New Package Contents: CMMG 57 X 28mm Barrel And Bcg Kit CMMG 57D88C3: Barrel and BCG Kit 8in 4140CM SBN 57 x 28mm
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