Davidson Defense One Round 16-inch Pistol-Gas 1:8 .300 BLK AR-15 Custom Handguard Rifle Complete Upper Build

One Round 16-inch Pistol-Gas 1:8 .300 Blackout AR-15 Custom Handguard Rifle Complete Upper

The One Round 16-inch Pistol-Gas 1:8 .300 Blackout AR-15 Custom Handguard Rifle Complete Upper from Davidson Defense is a complete upper for the AR-15 platform chambered in .300 Blackout. The configuration includes a 16-inch heavy-profile barrel, a Unique-ARs 15-inch Slim One Shot freefloat handguard, a 7075-T6 anodized upper receiver with M4 feed ramps, a micro low-profile steel gas block, a GI birdcage flash hider, a complete bolt carrier group, and a mil-spec charging handle.

Key Features

• 16-inch 4150 Chrome Moly Vanadium heavy-profile barrel in .300 Blackout with 1:8 twist rate
• Phosphate barrel finish
• 5/8x24 muzzle thread pitch
• Pistol-length gas system with micro low-profile .750 O.D. steel gas block
• GI birdcage flash hider, 5/8x24 TPI
• Unique-ARs 15-inch Slim One Shot freefloat handguard
• 7075-T6 anodized aluminum upper receiver with M4 feed ramps
• 9310 alloy steel bolt carrier group with nitride finish, made in the USA
• Mil-spec AR-15 M4 charging handle

Perfect For

• Builders completing an AR-15 rifle configuration in .300 Blackout
• Shooters sourcing a complete upper with bolt carrier group and charging handle included
• Builders prioritizing the Unique-ARs Slim One Shot handguard on a pistol-gas .300 Blackout platform
• Those working within the AR-15 pistol-length gas configuration in .300 Blackout

Barrel and Gas System

The 16-inch barrel is chambered in .300 Blackout and constructed from 4150 Chrome Moly Vanadium steel with a heavy barrel profile and a 1:8 twist rate. The phosphate finish covers the full barrel surface in a matte black corrosion-resistant coat. The muzzle is threaded 5/8x24 and includes a GI birdcage flash hider. The pistol-length gas system pairs with a micro low-profile steel gas block at .750 O.D., a separate component positioned beneath the handguard on the barrel.

Upper Receiver and Handguard

The upper receiver is machined from 7075-T6 aluminum with an anodized finish and M4 feed ramp compatibility. The Unique-ARs 15-inch Slim One Shot freefloat handguard provides a slim profile with accessory mounting options along its length without contact with the barrel or gas system components.

Bolt Carrier Group and Charging Handle

The complete bolt carrier group uses a 9310 alloy steel bolt with a nitride finish, is made in the USA, and is compatible with 5.56, .223, .300 Blackout, and .350 Legend configurations. The included mil-spec AR-15 M4 charging handle meets mil-spec dimensional standards for use with the upper receiver included in this configuration.

Follow safe handling and manufacturer instructions. Ensure compliance with all applicable federal, state, and local laws.