Davidson Defense Grimfang 4.5" 300 BLK AR-15 Upper Build with Dirty .30 Suppressor

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

This complete upper delivers a purpose-built .300 Blackout platform optimized for suppressed fire. The 4.5-inch Bear Creek Arsenal barrel with 1:7 twist pairs with a micro-length gas system, free-float handguard, and adjustable gas block for reliable cycling with subsonic and supersonic ammunition. The included Witt Machine The Dirty .30 suppressor threads directly to the muzzle, providing immediate noise reduction without additional purchases.

Key Features

• 4.5-inch Bear Creek Arsenal barrel, 1:7 twist, 4150 chrome moly vanadium steel with parkerized finish
• Micro-length gas system with adjustable skeletonized gas block for tuning
• 7-inch free-float smooth handguard for consistent accuracy and accessory mounting
• Complete AR-15 bolt carrier group compatible with .300 Blackout, 5.56 NATO, .223 Remington, and .350 Legend
• Mil-spec charging handle and forward assist assembly included
• Witt Machine The Dirty .30 suppressor, 4 inches, 416 stainless steel with graphite black Cerakote finish, threaded 5/8x24
• 7075-T6 aluminum upper receiver with anodized finish and M4 feed ramps

Perfect For

• Suppressed .300 Blackout builds prioritizing noise reduction and reliability
• Shooters wanting an integrated complete upper without sourcing individual components
• Pistol configurations and short-barreled rifle setups
• Subsonic and supersonic ammunition testing and training

Optimized for Suppressed Fire

The micro-length gas system paired with the adjustable gas block allows fine-tuning for both subsonic and supersonic loads. This is critical for .300 Blackout platforms where ammunition selection directly impacts cycling reliability. The 1:7 twist stabilizes heavier projectiles commonly used in subsonic loads, while the free-float handguard maintains consistency shot to shot without handguard contact affecting accuracy.

Integrated Suppressor Ready

The Witt Machine The Dirty .30 suppressor ships pre-threaded to the barrel at 5/8x24. This eliminates the need for separate suppressor sourcing and ensures thread compatibility from the factory. The suppressor reduces noise signature significantly while maintaining the compact profile necessary for pistol-length configurations.

Complete Upper Assembly

This upper includes the bolt carrier group, charging handle, forward assist assembly, and ejection port door with spring. The complete upper design means you bring only a compatible lower receiver to have a functional firearm. All internal components are USA-manufactured and tested for .300 Blackout operation.

Suppressor Performance

The Dirty .30 suppressor measures 4 inches in length and uses 416 stainless steel construction with graphite black Cerakote finish for durability. At this length paired with a 4.5-inch barrel, the overall package remains compact while delivering measurable sound signature reduction. The suppressor handles both standard and subsonic ammunition without modification.

May Dropship from Davidson Defense.

Verify suppressor compatibility with your lower receiver before use. Ensure secure mounting and proper timing before operation. Use only in accordance with applicable federal, state, and local laws.