Davidson Defense Grimfang 4.5" 300 BLK AR-15 Pistol Build Kit with SBA5 Brace

Grimfang w/SBA5 Brace 4.5-inch 1:7 300 BLK AR-15 Tubular Pistol Full Build Kit, Witt Machine The Dirty .30 Suppressor

This is a complete 300 Blackout AR-15 pistol build kit paired with a Witt Machine suppressor. The Grimfang platform combines a 4.5-inch Bear Creek Arsenal barrel with a free-float handguard, adjustable gas block, and SBA5 pistol brace. The kit includes everything except the lower receiver, plus the suppressor ready to mount.

Key Features

• 4.5-inch 300 Blackout barrel with 1:7 twist rate and micro-length gas system
• Free-float 7-inch smooth handguard for improved accuracy potential
• Adjustable skeletonized gas block for tuning to subsonic and supersonic loads
• SBA5 adjustable pistol stabilizing brace in black
• USA-made complete bolt carrier group compatible with 300 Blackout, 5.56 NATO, .223 Remington, and .350 Legend
• Witt Machine The Dirty .30 suppressor with 416 stainless steel construction and graphite black Cerakote finish
• Mil-spec lower parts kit, buffer tube, buffer, recoil spring, castle nut, and end plate included

Perfect For

• Shooters building a 300 Blackout pistol platform with suppressor integration
• Subsonic ammunition testing and quiet shooting applications
• Compact AR-15 pistol builds that prioritize barrel length and handling
• Builders seeking a complete kit with matched components and suppressor ready to go

300 Blackout Platform Advantage

The 300 Blackout cartridge was designed for suppressed, subsonic performance. This build kit pairs a short 4.5-inch barrel with the adjustable gas block, which lets you tune the system for both subsonic loads (heavier, slower rounds) and supersonic ammunition. The micro-length gas system keeps the action responsive without over-gassing, which matters when running a suppressor that adds back-pressure to the system.

Witt Machine The Dirty .30 Suppressor

The Dirty .30 is a 416 stainless steel suppressor built for .30 caliber platforms. At 4 inches long with graphite black Cerakote finish, it threads directly onto the 5/8x24 muzzle. The suppressor is included with the kit and ready to mount once you verify local suppressor laws and complete any required registration or paperwork in your jurisdiction.

Free-Float Handguard and Accuracy

The MFFAR7 free-float handguard eliminates contact between the barrel and the handguard, which reduces vibration and improves shot-to-shot consistency. This matters more on shorter barrels where harmonics can affect group size. The 7-inch length provides plenty of rail space for optics, lights, or other accessories while keeping the overall package compact.

SBA5 Pistol Brace Configuration

The SBA5 is an adjustable pistol stabilizing brace that mounts to the mil-spec carbine buffer tube included in this kit. It's designed to strap around your arm for stability. The brace is black and adjustable to fit different shooter preferences and shooting styles.

Follow safe handling and manufacturer instructions. Ensure compliance with all applicable federal, state, and local laws. Lower receiver not included. BCG and charging handle are not included. May dropship from Davidson Defense. Verify suppressor compatibility before use. Ensure secure mounting before operation. Use only in accordance with applicable laws.