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

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

The One Opportunity 16-inch Carbine-Gas 1:7 5.56 NATO AR-15 Custom Handguard Rifle Full Build Kit from Davidson Defense is a rifle-format full build kit chambered in 5.56 NATO. The kit includes a 16-inch medium-profile barrel, a black freefloat aluminum handguard, a 7075-T6 anodized upper receiver with M4 feed ramps, a micro low-profile gas block, a GI birdcage flash hider, a complete bolt carrier group, a mil-spec charging handle, a lower parts kit, a mil-spec heavy-duty 6-position aluminum buffer tube, a 3 oz buffer, recoil spring, a mil-spec receiver end plate, castle nut, and a SOPMOD-style collapsible stock. The lower receiver is 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
• GI birdcage flash hider, 1/2x28 TPI
• Black freefloat aluminum 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
• Mil-spec heavy-duty 6-position aluminum buffer tube with 3 oz buffer weight
• Mil-spec receiver end plate and castle nut included
• Lower parts kit included
• Nylon reinforced polymer SOPMOD-style collapsible stock with storage compartments and integrated QD mounts

Perfect For

• Builders seeking a complete 5.56 NATO rifle-format kit with stock included
• Shooters looking for a carbine-gas AR-15 rifle build with all primary components
• Builders prioritizing a freefloat aluminum handguard platform in 5.56 NATO
• Those wanting a ready-to-complete rifle kit with a SOPMOD-style collapsible stock

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. The carbine-length gas system pairs with a micro low-profile 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 black freefloat aluminum handguard provides 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 kit.

SOPMOD-Style Collapsible Stock

The nylon reinforced polymer SOPMOD-style collapsible stock is included as the stock component for this rifle-format full build kit. It features storage compartments and integrated QD mounts, and is compatible with the mil-spec heavy-duty 6-position buffer tube included in this kit.

Follow safe handling and manufacturer instructions. Ensure compliance with all applicable federal, state, and local laws. Lower receiver not included.