Davidson Defense Shortshot AR-15 Pistol Build Kit, 4.5-Inch 1:7 300 BLK, SBA6 Brace, Witt Dirty .30

Shortshot w/SBA6 Brace 4.5-inch 1:7 300 BLK AR-15 M-Lok Pistol Full Build Kit with The Dirty .30 Suppressor

This is a complete .300 Blackout AR-15 pistol build kit designed for suppressed shooting. It includes everything except the lower receiver, plus The Dirty .30 compact suppressor ready to mount. The 4.5-inch barrel paired with a micro gas system delivers reliable cycling with subsonic ammunition, and the 7-inch free-float M-LOK handguard keeps the platform modular and suppressor-ready.

Key Features

• 4.5-inch Bear Creek Arsenal barrel, 1:7 twist, 4150 CMV steel with parkerized finish
• Micro length gas system with adjustable skeletonized gas block for tuning
• 7-inch free-float aluminum M-LOK handguard with 1.77-inch bore diameter
• Complete AR-15 bolt carrier group compatible with .300 Blackout, 5.56 NATO, .223 Remington, and .350 Legend
• SB Tactical SBA6 pistol brace with 5-position adjustment
• The Dirty .30 compact suppressor, 416 stainless steel, 4 inches long, direct-thread 5/8x24
• Full lower parts kit, mil-spec buffer system, and AR-15 M4 charging handle included
• Anodized 7075-T6 aluminum upper receiver with M4 feed ramps and forward assist

Perfect For

• Suppressed .300 Blackout pistol builds using subsonic ammunition
• Shooters seeking a compact, modular platform with minimal recoil
• Operators building a dedicated short-range defensive or training rifle
• Builders who want a complete kit minus only the serialized lower receiver

Compact Suppressed Platform

The Dirty .30 suppressor is purpose-built for .30 caliber platforms and integrates seamlessly with this kit. At 4 inches long and machined from 416 stainless steel, it's designed for direct-thread mounting on the 5/8x24 barrel. The graphite black cerakote finish resists corrosion and blends with modern tactical setups. This suppressor pairs exceptionally well with subsonic .300 Blackout loads, delivering hearing-safe sound levels in a compact package.

Adjustable Gas System for Tuning

The adjustable skeletonized gas block allows you to fine-tune the rifle for your specific ammunition and suppressor setup. With a micro length gas tube and .750-inch journal diameter, the system cycles reliably with the compact barrel and can be tuned to reduce felt recoil or optimize reliability depending on your load. This flexibility is critical when running suppressed, as back-pressure changes with a can installed.

SBA6 Brace and Ergonomic Design

The SB Tactical SBA6 provides a secure mounting point with 5-position adjustment for length of pull. The brace is comfortable for extended shooting and works well with the compact profile of this pistol kit. The mil-spec carbine buffer tube and standard 3-ounce buffer deliver reliable cycling without excessive recoil impulse.

Suppressor Ready Configuration

The free-float handguard and adjustable gas block are both optimized for suppressor use. The 1.77-inch internal diameter allows ample clearance for sound suppressors, and the M-LOK mounting system keeps the platform modular for future upgrades. The handguard design minimizes contact with the barrel, maintaining accuracy and thermal stability even under suppressed fire.

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