Brigade Bm-300 300Blk 7.5 Blk Sba3 Mlok A2

The Brigade Arms BM-300 is a .300 Blackout AR pistol built for shooters who want a compact, modular platform without the SBR paperwork. This 7.5-inch barreled pistol pairs the subsonic versatility of .300 Blackout with a short sight radius and the handling characteristics serious shooters expect. Whether you're building a home-defense setup, a truck gun, or a specialized range rig, the BM-300 gives you the foundation to do it your way.

At the core is a 4150 chrome-moly barrel with 1:7 twist rate—the right spin for both subsonic and supersonic .300 Blackout loads—finished in hard-wearing nitride. The upper and lower receivers are machined from 7075-T6 aluminum forgings, the same material spec you'll find in high-end battle rifles, ensuring durability and consistent tolerances. The gas impingement system and included 5.56 bolt carrier group keep the design familiar to AR shooters and simple to maintain.

The SBA3 tactical brace gives you a solid point of contact without the compliance headache, and a 3-ounce buffer keeps felt recoil manageable in this handy format. Seven inches of M-Lok rail up top provides ample real estate for lights, lasers, or optical mounts—typical modern fighting setup without forced aesthetics. The included A2 flash hider threads at 5/8x32 (standard for .300 Blackout), and an ambi charging handle plus mil-spec trigger round out a no-nonsense, shootable package that arrives with a 30-round magazine.

This is a pistol that respects your time and budget while refusing to compromise on materials or function. Build it light for speed drills, add a suppressor for subsonic stealth, or shoot it as-is for reliable .300 Blackout performance at any range.

Key Features

• 7075-T6 aluminum forged upper and lower receivers for durability and precision tolerances
• 4150 chrome-moly barrel with 1:7 twist rate, nitride finished, optimized for .300 Blackout subsonic and supersonic loads
• Gas impingement system with included 5.56 bolt carrier group
• 7 inches of M-Lok rail for accessory mounting flexibility
• SBA3 tactical brace for stability and shootability
• A2 flash hider (5/8x32 threaded)
• Ambi charging handle for both-hand operation
• Mil-spec trigger and 3-ounce buffer
• Includes 30-round magazine
• Semi-automatic, AR15 platform

Specifications

Frequently Asked Questions

Will the .300 Blackout barrel work well with subsonic ammunition?

Yes. The 1:7 twist rate is ideal for stabilizing both subsonic and supersonic .300 Blackout loads, giving you flexibility in ammunition choice depending on your use case—hunting, suppressed shooting, or range work.

Can I add a suppressor to this pistol?

The muzzle is threaded at 5/8x32, which is the standard for .300 Blackout suppressors. You'll need to verify compliance with your local laws regarding suppressor use and pistol configurations.

What optic or accessory mounting options do I have?

The 7-inch M-Lok rail gives you multiple positions to mount lights, lasers, and optics. M-Lok is a proven industry standard with abundant aftermarket support, so you can tailor the setup to your intended use.

Is this a registered SBR, or does it comply as a pistol?

The BM-300 ships with an SBA3 tactical brace. Federal law regarding braces continues to evolve; verify current regulations in your jurisdiction before purchase and use.