Davidson Defense Poker Ace 10.5-inch AR-15 .300 BLK Pistol Upper Build Kit

Poker Ace 10.5-inch AR-15 .300 BLK Pistol Upper Build Kit

This is a complete upper build kit for .300 Blackout AR-15 pistols, featuring a 10.5-inch 4150 CrMoV barrel with pistol length gas system, 7075 T6 aluminum upper receiver with M4 feed ramps, and a 10-inch M-Lok handguard. The kit includes a low-profile gas block, forward assist assembly, ejection port door with spring, and a standard birdcage flash hider with crush washer. Everything you need for the upper assembly is included, except the bolt carrier group and charging handle.

Key Features

• 10.5-inch 4150 CrMoV barrel with 1:8 twist rate, optimized for .300 Blackout subsonic and supersonic ammunition
• 7075 T6 aluminum upper receiver with M4 feed ramps and anodized finish
• Pistol length gas system with low-profile gas block for compact profile
• 10-inch M-Lok handguard for accessory mounting flexibility
• 5/8x24 threaded muzzle for suppressor or muzzle device compatibility
• Forward assist assembly and ejection port door included

Perfect For

• Builders creating .300 Blackout pistol uppers for compact shooting platforms
• Shooters wanting a subsonic capable upper for suppressed configurations
• Home defense builds requiring a shorter, maneuverable profile
• Precision .300 BLK builds using the 1:8 twist rate for heavier subsonic loads

Pistol Length Gas System Advantage

The pistol length gas tube reduces overall system complexity and recoil impulse compared to carbine length systems in shorter barrels. This configuration cycles reliably with both subsonic and supersonic .300 Blackout ammunition while maintaining a compact footprint. The low-profile gas block keeps sight lines clear and reduces weight.

M-Lok Handguard Ecosystem

The 10-inch M-Lok handguard provides a modern mounting standard for lights, grips, and other tactical accessories. M-Lok slots run along the handguard for tool-free accessory installation, giving you flexibility to configure the upper for your specific use case without permanent modifications.

Suppressor Ready Configuration

The 5/8x24 threaded muzzle is the standard thread pitch for .300 Blackout suppressors. This upper is fully compatible with suppressed shooting, and the shorter 10.5-inch barrel length makes it ideal for subsonic ammunition where the suppressor becomes a functional component of the system rather than optional.

Follow safe handling and manufacturer instructions. Ensure compliance with all applicable federal, state, and local laws. BCG and charging handle are not included. Verify suppressor compatibility before use.