Davidson Defense Kingswake w/BTR Brace 11.5-inch Carbine-Gas 1:7 5.56 NATO AR-15 M-Lok Handguard Pistol Full Build Kit

Kingswake w/BTR Brace 11.5-inch 5.56 NATO AR-15 Full Build Kit

The Kingswake w/BTR Brace is built around an 11.5-inch 5.56 NATO barrel with an M4 profile, paired with a 7000 Series optimized AR-15 upper receiver. It pairs a 12-inch Air Lite Series honeycomb free-floating handguard with a Walker Steel Flash Can at the muzzle, running on a carbine-length gas system. A complete bolt carrier group, Mil-Spec charging handle, complete Lower Parts Kit, carbine buffer-system components, and a Magpul BTR pistol brace round out the rest of the build. The lower receiver is not included, leaving the buyer to select and supply that component separately.

Key Features

• 11.5-inch 5.56 NATO barrel, 1:7 twist, Phosphate finish
• Carbine-length gas system with micro low-profile steel gas block
• 7000 Series optimized AR-15 upper receiver, Type III black anodized
• 12-inch Air Lite Series honeycomb free-floating M-LOK handguard
• Walker Steel Flash Can, black oxide finish
• Magpul BTR pistol brace included
• Complete Mil-Spec Lower Parts Kit and carbine buffer-system components included
• Lower receiver is not included.

Barrel and Gas System

The barrel runs 11.5 inches long, chambered in 5.56 NATO and finished in phosphate with an M4 profile. It carries a 1:7 twist rate, well suited to stabilizing heavier 5.56 bullet weights, along with a 1/2x28 muzzle thread. Gas cycles back to the action through a carbine-length system, running a stainless steel carbine-length gas tube and a micro low-profile steel gas block sized to a .750-inch journal.

Upper Receiver and Handguard

The upper receiver is a 7000 Series optimized AR-15 unit finished in Type III black anodizing, with an integrated dust cover pin feature and a standard .223/5.56 ejection port door. Over the barrel sits a 12-inch Air Lite Series honeycomb handguard, free-floated and finished in black, using an M-LOK attachment system along its length. A full-length monolithic Picatinny rail runs across the top, giving the buyer a single continuous mounting surface from receiver to muzzle end.

Muzzle Device

Capping the muzzle is a Walker Steel Flash Can finished in black oxide. It threads onto the barrel's 1/2x28 pattern and is secured with the included 1/2-inch black crush washer.

Bolt Carrier Group and Charging Handle

A complete AR-15 bolt carrier group is included, made in the USA and listed for use across 5.56 NATO, .223 Remington, .300 Blackout, and .350 Legend. That broader listing describes the BCG itself; the barrel and chambering on this build remain 5.56 NATO. A Mil-Spec AR-15 M4 charging handle rounds out the upper's operating components.

Lower Parts Kit and Buffer System

A complete Mil-Spec AR-15 Lower Parts Kit covers the fire-control and lower-control internals needed once a lower receiver is on hand. Behind it sits a Mil-Spec heavy-duty six-position adjustable buffer tube, holding a standard AR-15 carbine buffer weighing 3 ounces and a standard USA-made recoil spring. A standard castle nut and Mil-Spec AR-15/M16 receiver end plate secure the buffer tube assembly to the lower.

Stabilizing Brace

Capping off the rear of the build is a Magpul BTR pistol brace finished in black. It's built for standard Mil-Spec carbine buffer tubes, matching the six-position buffer tube included with this kit.

Follow all manufacturer instructions and safe handling practices.

Ensure compliance with all applicable federal, state, and local laws.

Lower receiver is not included.