Brigade Bm-300 300Blk 10.5 Tung Sba3 Mlok A2

The Brigade BM-300 is a .300 Blackout AR pistol built around a 10.5-inch barrel, designed for shooters who want a compact, handy platform for close-quarters work, home defense, or suppressed shooting. This short-barreled rifle (SBR) or pistol configuration pairs a forged 7075-T6 aluminum upper and lower with a 4150 chrome-moly barrel finished in nitride, delivering the reliability AR shooters expect in a footprint that doesn't demand a stamp—or meets SBR requirements depending on your configuration with the included SBA3 brace. The gas impingement system keeps the action running smoothly with .300 Blackout's subsonic and supersonic loads alike.

The 10.5-inch barrel sports a 1:7 twist rate, the standard for stable .300 Blackout performance across a wide range of bullet weights. An A2 flash hider is already mounted, cutting down muzzle signature and blast—especially useful if you're running a suppressor (which is where .300 Blackout really shines). The upper is topped with 10 inches of M-Lok rail, giving you plenty of real estate for optics, lights, and accessories without the bulk of full-length Picatinny. The lower features a mil-spec trigger and ambi charging handle, so lefties and righties both get a smooth, intuitive manual of arms.

This is a 5.56 BCG platform, so feeding and ejection cycles like any standard AR. You get a 3-ounce buffer to manage recoil impulse with the shorter dwell time of a pistol-length gas tube. A 30-round magazine rounds out the package. If you're after a short, adaptable .300 Blackout that doesn't sacrifice quality or feature set, the Brigade BM-300 delivers without pretense.

Key Features

• Forged 7075-T6 aluminum upper and lower receivers for durability and light weight
• 10.5-inch 4150 chrome-moly barrel with nitride finish and 1:7 twist for .300 Blackout stability
• A2 flash hider factory-installed, ready for suppressor use
• 10-inch M-Lok rail for flexible optics and accessory mounting
• SBA3 tactical brace for improved control and handling
• Gas impingement system proven across subsonic and supersonic .300 Blackout loads
• Mil-spec trigger and ambi charging handle for smooth, ambidextrous operation
• 5.56 BCG with 3-ounce buffer for reliable cycle rate
• 30-round magazine included

Specifications

Frequently Asked Questions

Is the Brigade BM-300 a pistol or short-barreled rifle?

With the SBA3 brace installed, it functions as a stabilizing brace and can be configured as a pistol under current regulations, though local laws vary. If you intend SBR configuration with a stock, you'll need to register it accordingly. Check your local and federal regulations before final assembly.

What's included in the box?

The Brigade BM-300 comes with the complete upper and lower, the SBA3 brace, a 30-round magazine, and the A2 flash hider already mounted.

Will this handle suppressed .300 Blackout loads?

Yes. The gas impingement system is designed to cycle both subsonic and supersonic .300 Blackout ammunition. The 1:7 twist barrel and A2 flash hider (with 5/8 x 32 threading) are ideal for suppressed shooting, which is where .300 Blackout excels.

Can I mount an optic on the M-Lok rail?

The 10-inch M-Lok rail provides ample mounting space for optics and accessories. You'll need appropriate M-Lok adapter mounts or rail sections to attach your choice of sight.