Davidson Defense Dwarf King 4.5" 300 BLK AR-15 M-LOK Upper Build with Dirty .30 Suppressor

Dwarf King 4.5-inch 1:7 300 BLK AR-15 M-LOK Pistol Complete Upper Build with Witt Machine Suppressor

This is a compact 300 Blackout upper built for subsonic performance and suppressed shooting. The 4.5-inch barrel paired with a 1:7 twist rate optimizes heavier subsonic ammunition, while the included Witt Machine The Dirty .30 suppressor delivers effective sound reduction. The freefloat M-LOK handguard isolates the barrel for consistent accuracy, and the adjustable gas block lets you fine-tune cycling for your specific ammunition and setup.

Key Features

• 4.5-inch 300 Blackout barrel with 1:7 twist for subsonic ammunition optimization
• Freefloat 7-inch M-LOK aluminum handguard with 1.77-inch internal diameter
• Adjustable .750-inch skeletonized gas block for tuned cycling
• Witt Machine The Dirty .30 suppressor included, 4 inches long, 416 stainless steel with graphite black cerakote
• Panhead billet upper receiver with .458-size ejection port door
• Complete AR-15 bolt carrier group compatible with 5.56 NATO, .223 Remington, 300 Blackout, and .350 Legend
• Mil-spec M4 charging handle included
• Made in the USA bolt carrier group

Perfect For

• Shooters building compact 300 Blackout pistol configurations
• Suppressed subsonic shooting with heavier ammunition
• Shorter-range tactical or hunting applications
• Builders seeking a complete upper with integrated suppressor solution

Subsonic-Optimized Barrel and Twist Rate

The 1:7 twist rate is specifically designed to stabilize heavier 300 Blackout subsonic loads, typically ranging from 200 to 240 grains. This twist rate ensures consistent accuracy and reliability with subsonic ammunition, which is the primary advantage of 300 Blackout over standard rifle calibers. The 4.5-inch barrel length keeps the overall package compact while still allowing the round to reach optimal velocity for suppressed fire.

Freefloat Handguard and Gas Tuning

The 7-inch M-LOK handguard floats freely around the barrel, eliminating pressure points that can affect accuracy. The adjustable .750-inch gas block allows you to dial in the right amount of gas for your specific ammunition and suppressor setup, reducing felt recoil and improving reliability. This combination is essential for suppressed 300 Blackout builds where ammunition variability can affect cycling.

Included Witt Machine Suppressor

The Dirty .30 is a compact 4-inch suppressor built from 416 stainless steel with graphite black cerakote finish. At 4 inches, it adds minimal length to the already compact 4.5-inch barrel, keeping the total package maneuverable. The suppressor threads directly onto the 5/8x24 muzzle, and the handguard internal diameter of 1.77 inches accommodates the suppressor body for a streamlined profile.

Complete Upper Configuration

This upper includes the bolt carrier group and charging handle, so you have everything needed to mate to a lower receiver. The bolt carrier group is made in the USA and handles 300 Blackout, 5.56 NATO, .223 Remington, and .350 Legend, giving you flexibility if you decide to use this BCG in other builds. The panhead billet upper receiver has no forward assist, keeping weight and profile minimal for pistol configurations.

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.