Davidson Defense SBR Ready Shortshot AR-15 Pistol Build Kit, 4.5-Inch 1:7 300 BLK, Witt Dirty .30

Shortshot SBR Ready 4.5-Inch 300 Blackout AR-15 Full Build Kit with The Dirty .30 Suppressor

This is a complete .300 Blackout SBR pistol configuration built on a 4.5-inch Bear Creek Arsenal barrel with a 1:7 twist rate optimized for subsonic ammunition. The kit includes a freefloat M-LOK handguard, adjustable gas block, complete bolt carrier group, charging handle, lower parts kit, buffer system components, and The Dirty .30 suppressor ready to mount. Everything you need except the serialized lower receiver.

Key Features

• 4.5-inch Bear Creek Arsenal barrel, 1:7 twist, 4150 Chrome Moly Vanadium steel with Parkerized finish
• Freefloat 7-inch aluminum M-LOK handguard with 1.77-inch internal diameter
• Adjustable skeletonized .750-inch gas block for micro-length gas system tuning
• Complete mil-spec bolt carrier group compatible with .300 Blackout, 5.56 NATO, .223 Remington, and .350 Legend
• Mil-spec charging handle, lower parts kit, and standard fire control group included
• Heavy-duty 6-position carbine buffer tube with standard 3-ounce buffer and carbine recoil spring
• The Dirty .30 suppressor included, 416 stainless steel, 4 inches long, 5/8x24 thread pitch
• SBR Ready configuration, ships without a brace

Perfect For

• Shooters building a short-range .300 Blackout platform for subsonic suppressed fire
• SBR builders selecting their own stock or brace configuration
• Hunters and tactical shooters prioritizing compact size with suppressor integration
• Builders who want a complete upper and lower parts package minus the serialized receiver

SBR Ready Configuration

This kit ships without a brace and is designed for shooters who plan to select their own final configuration based on their specific needs. The 4.5-inch barrel paired with the micro-length gas system creates a compact platform ideal for short-range applications. Configuration choices determine the final setup, so verify your intended use and local compliance before assembly.

The Dirty .30 Suppressor Integration

The Dirty .30 suppressor comes ready to attach at the 5/8x24 muzzle thread. This 416 stainless steel unit measures 4 inches long with a graphite black Cerakote finish. The .300 Blackout cartridge is purpose-built for suppressed fire, and this suppressor pairs directly with the included muzzle thread without requiring additional adapters. Verify compatibility with your ammunition selection before use.

Adjustable Gas Block Tuning

The skeletonized adjustable gas block allows you to fine-tune the gas system for your specific ammunition. .300 Blackout performance varies significantly between subsonic and supersonic loads, so the adjustable block lets you optimize cycling without replacing components. The .750-inch diameter matches the micro-length gas tube for proper operation.

Follow safe handling and manufacturer instructions. Ensure compliance with all applicable federal, state, and local laws. Lower receiver not included. Ships without a brace. Do not attach a stock unless compliant with applicable laws. Verify suppressor compatibility before use. Ensure secure mounting before operation. May Dropship from Davidson Defense.