AR15 12.5" 300BLK Mr Barrel
$181.99 at Ammunition Depot · 6 stores
In stock
Barrel Sub-Assembly 300 Blackout - 16.1" Bbl Sub-Assy Medium Taper 1-7 5/8-24" Bbss
No ratings yetBest price
$172.99at Brownells
Out of stock checked Oct 22, 2026
In stock now instead
- AR15 12.5" 300BLK Mr Barrel $181.99at Ammunition Depot
- AR15 8.2" 300BLK Mr Barrel $153.99at Ammunition Depot
- Ballistic Advantage Modern Series .300 BLK 1/7 4150 CrMoV - 16" $171.00at OpticsPlanet
Where to buy
| Store | Price | Availability | Buy | Add to build |
|---|---|---|---|---|
| Brownells Best price | $172.99checked Oct 22, 2026 | Out of stock | Buy at Brownells | |
| OpticsPlanet | $193.99Salechecked 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.
Similar barrels in stock
This part is out of stock at every store we track. These similar barrels are in stock, with today's prices.
AR15 8.2" 300BLK Mr Barrel
$153.99 at Ammunition Depot · 6 stores
In stock
Ballistic Advantage Modern Series .300 BLK 1/7 4150 CrMoV - 16"
$171.00 at OpticsPlanet · 7 stores
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Pistol Length Match 300BLK 6" 1-5 Twist Gunner Contour SS Bbl Nitride
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Pistol Length Match 300BLK 7.5" 1-5 Twist Gunner Contour SS Bbl Nitride
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Performance Series 300 Blackout 10.3" Hanson Pistol W/Lo Pro
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Price history
Dashed line = out of stock. Tracking since Sep 28, 2026.
Show the prices as a table
| Store | Latest | Lowest | Highest |
|---|---|---|---|
| Brownells | $172.99 | $172.99 | $172.99 |
| OpticsPlanet | $193.99 | $193.99 | $193.99 |
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" Bbss is a 16.1" 300 Blackout barrel from CMMG with a carbine gas system. It's sold by 2 stores, from $172.99 to $193.99.
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
- 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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