Davidson Defense Grimfang 4.5" 300 BLK AR-15 Full Build Kit, BTR Brace & Dirty .30 Suppressor

Grimfang w/BTR Brace 4.5-inch 1:7 300 BLK AR-15 Tubular Pistol Full Build Kit

This is a complete .300 Blackout AR-15 pistol build kit with everything you need except the lower receiver. It comes with a 4.5-inch Bear Creek Arsenal barrel, free-float handguard, adjustable gas block, Magpul BTR brace, and the included Witt Machine The Dirty .30 suppressor. The micro gas system is tuned for subsonic ammunition, and the adjustable gas block lets you fine-tune cycling to your specific load. This kit is suppressor-ready out of the box.

Key Features

• 4.5-inch Bear Creek Arsenal barrel, 1:7 twist, 4150 chrome moly steel for reliable subsonic performance
• Micro-length gas system with adjustable skeletonized gas block for tuned cycling
• 7-inch free-float handguard with smooth profile for lightweight handling
• Magpul BTR brace for stable one-handed control
• Complete bolt carrier group, charging handle, lower parts kit, and buffer system included
• Witt Machine The Dirty .30 suppressor included, 4 inches long, 416 stainless steel with graphite black finish
• Lower receiver not included

Perfect For

• Shooters building a suppressed .300 Blackout pistol on a budget
• Hunters and sport shooters using subsonic ammunition
• Builders who want a complete upper and lower component set without the serialized receiver
• Those looking for a compact, quiet platform for home defense or range use

Suppressor-Ready Configuration

This kit ships with the Witt Machine The Dirty .30 suppressor already included. The 4.5-inch barrel and micro gas system are optimized for subsonic .300 Blackout ammunition, which pairs well with the included suppressor. The adjustable gas block allows you to dial in the right amount of gas for your specific ammunition, which is especially important when running suppressed. The 5/8x24 muzzle threads match the suppressor directly, so you're ready to assemble and shoot.

Complete Component Package

The full build kit includes the bolt carrier group, charging handle, complete lower parts kit, buffer tube, buffer, recoil spring, end plate, and castle nut. The Magpul BTR brace provides a stable platform for one-handed control without the need for a stock. All you need to add is a stripped lower receiver and you have a complete, functional pistol. The kit uses standard mil-spec AR-15 components throughout, so compatibility with aftermarket upgrades is straightforward.

Adjustable Gas System for Tuned Performance

The micro-length gas tube and adjustable skeletonized gas block let you control the amount of gas cycling through the bolt carrier group. This is especially useful when running suppressed, since the added back-pressure from the suppressor can over-cycle the action. With the adjustable block, you can reduce gas flow to get reliable cycling without excessive wear or uncomfortable recoil impulse. The .750-inch gas journal diameter matches standard micro gas system components.

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