Davidson Defense One Opportunity 16-inch Carbine-Gas 1:7 5.56 NATO AR-15 Custom Handguard Rifle Upper Build Kit

One Opportunity 16-inch Carbine-Gas 1:7 5.56 NATO AR-15 Custom Handguard Rifle Upper Build Kit

The One Opportunity 16-inch Carbine-Gas 1:7 5.56 NATO AR-15 Custom Handguard Rifle Upper Build Kit from Davidson Defense is an upper build kit for the AR-15 platform chambered in 5.56 NATO. The kit includes a 16-inch medium-profile barrel, a Unique-ARs 15-inch Slim One Shot handguard, a 7075-T6 anodized upper receiver with M4 feed ramps, a micro low-profile gas block, and a GI birdcage flash hider. BCG and charging handle are not included.

Key Features

• 16-inch 4150 Chrome Moly Vanadium medium-profile barrel in 5.56 NATO with 1:7 twist rate
• Nitride barrel finish
• 1/2x28 muzzle thread pitch
• Carbine-length gas system with micro low-profile .750 O.D. gas block, phosphate finish
• GI birdcage flash hider, 1/2x28 TPI, manganese phosphate finish
• Unique-ARs 15-inch Slim One Shot handguard
• 7075-T6 anodized aluminum upper receiver with M4 feed ramps
• BCG and charging handle not included

Perfect For

• Builders completing an AR-15 rifle upper in 5.56 NATO
• Shooters sourcing their own bolt carrier group and charging handle
• Builders prioritizing the Unique-ARs Slim One Shot handguard on the AR-15 platform
• Those working within the AR-15 carbine-gas configuration

Barrel and Gas System

The 16-inch barrel is chambered in 5.56 NATO and constructed from 4150 Chrome Moly Vanadium steel with a medium profile and a 1:7 twist rate. The nitride finish covers the full barrel surface for corrosion and wear resistance. The muzzle is threaded 1/2x28 and includes a GI birdcage flash hider with a manganese phosphate finish. The carbine-length gas system pairs with a micro low-profile gas block at .750 O.D. with a phosphate finish, 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 handguard provides a slim profile with accessory mounting options along its length without contact with the barrel or gas system components.

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