Davidson Defense Dwarf King SBR Ready AR-15 M-LOK Pistol Full Build Kit, 4.5-Inch 1:7 300 BLK, Dirty .30

Dwarf King SBR Ready 4.5-inch 300 Blackout AR-15 M-LOK Pistol Full Build Kit with Witt Machine The Dirty .30 Suppressor

This is a complete SBR-ready 300 Blackout pistol build kit designed for shooters who want a compact, suppressor-optimized platform with all the core components included. The kit pairs a Bear Creek Arsenal 4.5-inch barrel with a Panhead billet upper receiver, adjustable gas block, and a 7-inch M-LOK handguard. Everything you need to finish a lower receiver is included: complete bolt carrier group, charging handle, lower parts kit, buffer tube, buffer, recoil spring, end plate, and castle nut. The Witt Machine The Dirty .30 suppressor is included, giving you a ready-to-configure platform for subsonic or supersonic 300 Blackout ammunition.

Key Features

• SBR Ready configuration, ships without a brace
• Bear Creek Arsenal 4.5-inch 300 Blackout barrel, 1:7 twist, 4150 Chrome Moly Vanadium steel with Parkerized finish
• Panhead billet upper receiver with no forward assist and enlarged .458-style ejection port
• Adjustable skeletonized clamp-on gas block paired with 5.25-inch micro-length gas tube for fine-tuned cycling
• 7-inch tubular M-LOK handguard with 1.77-inch internal diameter, suppressor-ready design
• Complete AR-15 bolt carrier group made in the USA, compatible with 5.56 NATO, .223 Remington, .300 Blackout, and .350 Legend
• Mil-spec charging handle, lower parts kit with fire control group, and carbine buffer system included
• Witt Machine The Dirty .30 suppressor in 416 stainless steel with Graphite Black Cerakote, 4 inches long, threaded 5/8x24

Perfect For

• Shooters building a compact, suppressor-optimized 300 Blackout platform
• SBR-ready configurations for customers selecting their own final stock or brace setup
• Subsonic ammunition testing and development
• Home defense and close-quarters applications
• Experienced builders comfortable with lower receiver completion

SBR Ready Configuration

This kit ships without a brace, allowing you to select your own final configuration based on your compliance needs. The platform is purpose-built for SBR registration or pistol configuration depending on your jurisdiction and intended setup. The 4.5-inch barrel paired with the adjustable gas block gives you flexibility to tune the rifle for either subsonic or supersonic 300 Blackout loads. Configuration choices are entirely your responsibility based on local and federal law.

Suppressor-Optimized Design

The 7-inch M-LOK handguard features a 1.77-inch internal diameter specifically sized to accommodate the included Witt Machine The Dirty .30 suppressor without interference. The adjustable gas block lets you dial in cycling for suppressed fire, reducing felt recoil and controlling bolt speed. The Panhead upper receiver includes an enlarged .458-style ejection port, which improves reliability when running suppressed ammunition that may produce higher back-pressure.

Complete Component Breakdown

The kit includes a complete bolt carrier group made in the USA, a mil-spec charging handle, a full lower parts kit with fire control group, heavy-duty carbine buffer tube, standard 3-ounce carbine buffer, standard carbine recoil spring, mil-spec receiver end plate, and carbine castle nut. Lower receiver not included. The Witt Machine The Dirty .30 suppressor is finished in Graphite Black Cerakote and threaded 5/8x24 to match the barrel.

Follow safe handling and manufacturer instructions. Ensure compliance with all applicable federal, state, and local laws. Ships without a brace. Do not attach a stock unless compliant with applicable 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.