AR15 12.5" 300BLK Mr Barrel
$192.99 at MidwayUSA · 4 stores
In stock
Barrel Sub-Assembly 300 Blackout - 16.1" Bbl Sub-Assy Medium Taper 1-7 5/8-24" Black Nitride
CMMG · Barrels
No ratings yetBest price
$193.99at Ammunition Depot
In stock checked Oct 2, 2026
Where to buy
| Store | Price | Availability | Buy | Add to build |
|---|---|---|---|---|
| Ammunition Depot Best price | $193.99checked Oct 2, 2026 | In stock | Buy at Ammunition Depot | |
| OpticsPlanet | $219.99Salechecked Oct 2, 2026 | In stock | Buy at OpticsPlanet | |
| CMMG | $199.95checked Oct 2, 2026 | Check store | Buy at CMMG | |
| Palmetto State Armory | $219.99checked Oct 2, 2026 | Check store | Buy at Palmetto State Armory | |
| Brownells | $215.38checked Oct 2, 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
Lowest in-stock price in the last 30 days: $193.99 at Ammunition Depot. Dashed line = out of stock. Tracking since Sep 28, 2026.
Show the prices as a table
| Store | Latest | Lowest | Highest |
|---|---|---|---|
| Ammunition Depot | $193.99 | $193.99 | $193.99 |
| Brownells | $215.38 | $215.38 | $215.38 |
| CMMG | $199.95 | $199.95 | $199.95 |
| OpticsPlanet | $219.99 | $219.99 | $219.99 |
| Palmetto State Armory | $219.99 | $219.99 | $219.99 |
Since Sep 28, 2026.
About this part
The Barrel Sub-Assembly 300 Blackout - 16.1" Bbl Sub-Assy Medium Taper 1-7 5/8-24" Black Nitride is a 16.1" 300 Blackout barrel from CMMG with a carbine gas system. It's sold by 5 stores (2 in stock), from $193.99 to $219.99. The lowest in-stock price in the last 30 days was $193.99 at Ammunition Depot.
Fits and works with
- Caliber
- 300 Blackout · Shop matching ammo
- Bolt
- Standard AR-15 (5.56 / 300 BLK / .350 Legend) · Bolt carrier groups
- Gas system
- Carbine · Handguards
- Muzzle thread
- 5/8x24 · Muzzle devices
- Barrel length
- 16.1" · Handguards
Specifications
- Manufacturer
- CMMG
- Color
- Black
- Platform
- AR-15
- Caliber
- 300 Blackout
- Gas system
- Carbine
- Barrel length
- 16.1"
- Thread pattern
- 5/8 x 24
From the manufacturer
Perfect for building your custom AR15 upper group. Comes with a properly installed M4 barrel extension. All barrel sub-assemblies are properly headspaced. Chambered in .300 Blackout 16.1" Barrel Length Medium Taper Contour Carbine Gas System Length 5/8-24 Threads 1-7 Barrel Twist Available in a Bead Blasted Stainless Steel or Salt Bath Nitride Finish Mfg: Cmmg
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