Davidson Defense Grimfang AR-15 4.5" 300 BLK Pistol Upper Build Kit with Witt Machine Dirty .30

Grimfang 4.5-Inch 1:7 300 Blackout AR-15 Pistol Upper Build Kit with Witt Machine Suppressor

This is a complete upper assembly for .300 Blackout AR-15 pistol builds. It includes a 4.5-inch barrel with 1:7 twist rate, a free-float handguard, an adjustable gas block, and the Witt Machine The Dirty .30 suppressor. The barrel is made from 4150 chrome moly vanadium steel with parkerized finish. The upper receiver is 7075-T6 aluminum with anodized finish and includes forward assist and ejection port door assemblies. This configuration is optimized for subsonic ammunition and short-range applications where compact size and integrated suppression matter.

Key Features

• 4.5-inch Bear Creek Arsenal barrel with 1:7 twist for .300 Blackout
• Adjustable skeletonized gas block for micro-length gas system tuning
• 7-inch free-float smooth handguard in black anodized aluminum
• Witt Machine The Dirty .30 suppressor included with 5/8x24 threading
• 7075-T6 aluminum upper receiver with M4 feed ramps and forward assist
• Parkerized barrel finish and graphite black cerakote suppressor finish

Perfect For

• Pistol builds using subsonic .300 Blackout ammunition
• Short-range tactical configurations with integrated suppression
• Shooters prioritizing compact size and noise reduction
• Builders seeking a complete upper assembly with suppressor included

Optimized for Subsonic Performance

The 1:7 twist rate and 4.5-inch barrel length work together to stabilize heavier subsonic rounds effectively. The adjustable gas block allows fine-tuning for different ammunition types and suppressor configurations. The micro-length gas system is designed specifically for short barrels, reducing felt recoil and improving reliability with suppressed fire. This combination makes the upper suitable for both supersonic and subsonic loads, though subsonic ammunition maximizes the suppressor benefits.

Integrated Suppressor Ecosystem

The Witt Machine The Dirty .30 suppressor ships installed and ready. It's constructed from 416 stainless steel with graphite black cerakote finish, rated for .30 caliber applications. The 5/8x24 thread pitch matches the barrel, and the 4-inch length maintains the compact profile of the pistol configuration. The suppressor reduces sound signature while working with the adjustable gas block to manage cycling and recoil.

Upper Assembly Configuration

The free-float handguard isolates the barrel from the upper receiver, improving consistency when shooting suppressed. The 7-inch length provides mounting flexibility while maintaining the compact pistol profile. The 7075-T6 aluminum upper receiver includes all standard assemblies: forward assist, ejection port door with rod and spring, and M4 feed ramps for reliable feeding. No additional components are required for the upper assembly itself.

BCG and charging handle are not included. May Dropship from Davidson Defense. 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.