The LMT Monolithic .300 AAC Blackout 16” Pistol-Length Barrel in Black (LMT part no. R-L7BK1B) pairs a rifle-length 16-inch barrel with a shorter pistol-length gas system, chambered in .300 AAC Blackout on LMT’s MRP monolithic upper platform. This combination gives a longer sight radius and more velocity than a short pistol barrel while keeping the gas system compact for reliable cycling. The 1-in-7 twist handles the full range of .300 Blackout bullet weights, from light supersonic to heavy subsonic loads. LMT builds this barrel to the same spec used across its complete rifle lineup.

Key Specifications

• Measures 16 inches long, paired with a shorter pistol-length gas system.
• Chambered in .300 AAC Blackout, suited to both supersonic and subsonic loads.
• Rifled with a 1-in-7 twist, stabilizing the full range of .300 Blackout bullet weights.
• Built for the LMT MRP monolithic upper platform, and finished in black.
• Paired with a pistol-length gas system, giving more velocity than a shorter barrel while keeping the system compact.
• Compatible with LMT’s MRP monolithic upper receiver platform.
• Uses a standard barrel extension compatible with mil-spec 5.56 bolt carrier groups.

Frequently Asked Questions

Why pair a 16-inch barrel with a pistol-length gas system? It gives more velocity and a longer sight radius than a short pistol barrel while keeping the gas system compact for tuning with suppressors and subsonic ammunition.

Does this barrel fit LMT’s own upper receivers? Yes, it’s built to mate with the LMT MRP monolithic upper receiver system.

Buy the LMT Monolithic .300 AAC Blackout 16-inch Pistol-Length Barrel, Black

Order the LMT Defense .300 Blackout barrel from our AR barrels selection, shipped fast and insured from our Lubbock, Texas gun shop.