Customs Davidson Defense AR15 'Mockingbird Gen 2' 9MM Full Build Kit

Davidson Defense Mockingbird Gen 2 9MM Full Build Kit

The Mockingbird Gen 2 is a complete 9mm AR platform build kit designed for shooters who want a compact, reliable pistol-caliber rifle without assembling from scattered components. This full build kit includes everything needed to complete a lower receiver except the serialized lower itself, featuring a 6-inch nitride barrel, billet aluminum upper receiver, M-LOK handguard, and SB Tactical SBA3 pistol brace.

Key Features

• 6-inch 4150 CrMoV nitride barrel with 1:10 twist rate and 1/2x28 thread pitch
• Billet aluminum upper receiver with Type III hard coat anodized finish
• 4-inch M-LOK free-float handguard for accessory mounting flexibility
• 9mm nitride bolt carrier group compatible with Glock and Colt magazines
• SB Tactical SBA3 adjustable pistol stabilizing brace
• Mil-spec heavy-duty buffer tube and M4 charging handle included
• AR-15 1/2x28 GI birdcage flash hider

Perfect For

• Shooters building a compact 9mm platform for home defense or range use
• Builders who want a complete upper and lower parts kit in one purchase
• Those seeking a reliable pistol-caliber alternative to 5.56 configurations
• Owners of Glock or Colt magazine-fed firearms looking for platform compatibility

Compact 9mm Platform Design

The Mockingbird Gen 2 combines a short 6-inch barrel with a 4-inch handguard to create a highly maneuverable 9mm platform. The 1:10 twist rate stabilizes standard 9x19 ammunition reliably across a wide range of grain weights. The nitride finish on both barrel and bolt carrier group provides corrosion resistance and durability for regular shooting.

Magazine Compatibility and Feeding

This kit uses a 9mm bolt carrier group with an external extractor design that feeds reliably from both Glock and Colt magazines, giving you flexibility in magazine selection. The platform supports standard AR-15 lower receivers, so magazine compatibility depends on your lower receiver's feed lips and magazine well tolerances.

Accessory Mounting and Customization

The 4-inch M-LOK handguard provides multiple mounting points for lights, lasers, or vertical grips without adding significant weight. The 1/2x28 threaded muzzle accepts standard AR-15 suppressors and muzzle devices, allowing you to tailor the platform to your specific needs.

Buffer Tube and Brace Configuration

The kit includes a mil-spec heavy-duty 6-position buffer tube and the SB Tactical SBA3 adjustable pistol stabilizing brace. The brace adjusts to accommodate different shooting preferences and hand sizes while maintaining a compact profile.

Follow safe handling and manufacturer instructions. Ensure compliance with all applicable federal, state, and local laws. Lower receiver not included. BCG and charging handle are not included in upper build kits, but this full build kit includes both. Verify magazine compatibility before use.