Cmmg Ar15 12.5" 300blk Mr Barrel
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CMMG
Overview
The CMMG AR-15 12.5" 300 Blackout MR Barrel is designed for optimized performance with a medium profile that balances weight and rigidity, making it ideal for various shooting applications. With a twist rate of 1:7, this barrel effectively stabilizes heavier projectiles, enhancing accuracy and terminal ballistics. The pistol-length gas system and .750 gas block diameter ensure reliable cycling, which is essential for builds tailored for short-barreled configurations or those seeking compact setups. This barrel is commonly integrated into builds that focus on the 300 Blackout caliber, particularly where a pistol gas system is preferred.
Specifications
Frequently Built With
Based on build data
Wilson Combat Ar-15 Billet Upper Receiver
Upper Receiver
BLEM PSA AR15 Complete Classic Stealth Lower, Black
Lower Receiver
Battle Arms Development Rack Ambidextrous Ar-15 Charging Handle - Mod C
Charging Handle
Wilson Combat Ar-15 Lo-Profile Gas Block .750" Black
Gas Block
Wmd Guns Ar-15 Gas Tube Nitromet Mid-Length
Gas Tube
Aero Precision M4e1 Complete Lower Receiver W/moe Sl Grip & Sl-S Carbine Stock
Lower ReceiverBuild Configuration Breakdown
Aggregated and anonymized data showing how builders use this product
PlatformBased on real build data showing which platform (AR-15, AR-10, AR-9) builders pair with this product.
CaliberBased on real build data showing which calibers builders choose alongside this product.
Gas SystemBased on real build data showing which gas system lengths builders use with this product.
| Product | Category | Times Built Together |
|---|---|---|
| Wilson Combat Ar-15 Billet Upper Receiver | Upper Receiver | 153 |
| BLEM PSA AR15 Complete Classic Stealth Lower, Black | Lower Receiver | 146 |
| Battle Arms Development Rack Ambidextrous Ar-15 Charging Handle - Mod C | Charging Handle | 144 |
| Wilson Combat Ar-15 Lo-Profile Gas Block .750" Black | Gas Block | 136 |
| Wmd Guns Ar-15 Gas Tube Nitromet Mid-Length | Gas Tube | 132 |
| Aero Precision M4e1 Complete Lower Receiver W/moe Sl Grip & Sl-S Carbine Stock | Lower Receiver | 118 |
| Platform | Percentage |
|---|---|
| AR-15 | 88.2% |
| AR-10 | 9.1% |
| AR-9 | 2.6% |
| Caliber | Percentage |
|---|---|
| 300 Blackout | 100% |
| Gas System | Percentage |
|---|---|
| Pistol | 100% |
Builds Featuring This Part
See all 2 →Builds in the community that include the Cmmg Ar15 12.5" 300blk Mr Barrel
| Build | Parts | Total |
|---|---|---|
 | 15 | $1091.76 |
 | 21 | $1252.87 |
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