Davidson Defense Kingswake w/SBA3 Brace 11.5-inch Carbine-Gas 1:7 5.56 NATO AR-15 Freefloat M-Lok Handguard Pistol Full Build Kit

Kingswake w/SBA3 Brace 11.5-inch 5.56 NATO AR-15 Full Build Kit

The Kingswake w/SBA3 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 an SB Tactical SBA3 adjustable pistol stabilizing 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
• SB Tactical SBA3 adjustable pistol stabilizing 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 a 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 monolithic Picatinny top rail runs along the top, giving the buyer a single continuous mounting surface.

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 an SB Tactical SBA3 adjustable pistol stabilizing brace finished in black. It's built to fit a Mil-Spec carbine buffer tube, 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.