Davidson Defense Left-Handed Labyrinth w/SBA3 Brace 8.5-inch Pistol-Gas 1:7 5.56 NATO AR-15 Freefloat Tubular Handguard Pistol Full Build Kit

Left-Handed Labyrinth w-SBA3 Brace 8.5-Inch Pistol-Gas 1-7 5.56 NATO AR-15 Freefloat Tubular Handguard Pistol Full Build Kit

This is a left-handed AR-15 pistol full build kit chambered in 5.56 NATO, centered on an 8.5-inch M4 contour steel barrel with a 1-7 twist rate and a pistol-length gas system. The Black Diamond Series left-handed slick side billet aluminum upper receiver with a black anodized finish anchors the front end with a left-hand ejection port and a clean slick side exterior that omits the forward assist and dust cover from the receiver body. The pistol-length gas tube and micro low-profile steel gas block at .750 O.D. complete the gas system, and the 7-inch freefloat smooth handguard covers the compact forend. An A2 GI Birdcage flash hider at 1-2x28 closes out the muzzle end. A Davidson Defense premium left-handed M16 nitride bolt carrier group and a Mil-Spec M4 charging handle complete the upper side. The lower completion package covers a complete Mil-Spec AR-15 lower parts kit with Mil-Spec curved trigger and Mil-Spec A2 grip in black, a Mil-Spec heavy-duty 6-position buffer tube, a standard AR-15 carbine buffer at 3 oz., a standard AR-15 carbine recoil spring made in the USA, a Mil-Spec AR-15 and M16 receiver end plate, and a Mil-Spec AR-15 carbine castle nut. An SB Tactical SBA3 adjustable pistol stabilizing brace in black closes out the rear end. Lower receiver not included.

Key Features

• 5.56 NATO chambering, 8.5-inch M4 contour steel barrel, 1-7 twist rate
• Pistol-length gas system with pistol-length gas tube
• Micro low-profile steel gas block, .750 O.D.
• Black Diamond Series left-handed slick side billet aluminum upper receiver, black anodized, no forward assist, no dust cover
• 7-inch freefloat smooth handguard
• Davidson Defense premium left-handed M16 bolt carrier group, nitride finish
• Mil-Spec AR-15 M4 charging handle
• A2 GI Birdcage flash hider, 1-2x28 thread pitch
• Black 1-2-inch crush washer
• Complete Mil-Spec AR-15 lower parts kit with Mil-Spec curved trigger and Mil-Spec A2 grip, black
• Mil-Spec heavy-duty 6-position buffer tube
• Standard AR-15 carbine buffer, 3 oz.
• Standard AR-15 carbine recoil spring, made in the USA
• Mil-Spec AR-15 and M16 receiver end plate
• Mil-Spec AR-15 carbine castle nut
• SB Tactical SBA3 adjustable pistol stabilizing brace, black

Perfect For

• Left-handed AR-15 pistol builders who need everything above the lower receiver for a 5.56 NATO build
• Shooters pairing this kit with an existing stripped or complete AR-15 lower receiver configured for left-hand operation
• Left-handed builders who want an SBA3 brace and a complete 5.56 pistol component set with a purpose-built left-hand ejection slick side billet upper and smooth tubular handguard covered in one kit

Upper Assembly

The Black Diamond Series left-handed slick side billet aluminum upper receiver with a black anodized finish anchors the front end with a left-hand ejection port and a clean slick side exterior profile that omits both the forward assist and dust cover from the receiver body. The 8.5-inch M4 contour steel barrel brings a 1-7 twist rate to the 5.56 NATO chamber, threaded at 1-2x28. The pistol-length gas tube and micro low-profile steel gas block at .750 O.D. run a pistol-length gas system along the 8.5-inch barrel. The 7-inch freefloat smooth handguard surrounds the barrel and gas system along the compact forend with a smooth exterior profile that omits slots or rail sections for a clean uninterrupted handguard surface.

Bolt Carrier Group and Charging Handle

The Davidson Defense premium left-handed M16 bolt carrier group carries a nitride finish and is a purpose-built left-hand BCG designed to function with the left-handed upper receiver and eject cases from the left side of the build. The Mil-Spec M4 charging handle pairs with the BCG inside the upper receiver to complete the upper interior and finish the front end of the build.

Muzzle Device

The A2 GI Birdcage flash hider threads onto the 1-2x28 muzzle end of the barrel. The included black 1-2-inch crush washer seats at the barrel shoulder and completes the muzzle hardware for this kit.

Lower Completion Components

The complete Mil-Spec AR-15 lower parts kit covers the full internal lower component group, including the Mil-Spec curved trigger, fire control group, magazine catch, bolt catch, and all associated pins and springs, with a Mil-Spec A2 grip in black covering the grip interface. The Mil-Spec heavy-duty 6-position buffer tube, standard AR-15 carbine buffer at 3 oz., and standard AR-15 carbine recoil spring made in the USA form the buffer system at the rear of the lower. The Mil-Spec AR-15 and M16 receiver end plate and Mil-Spec AR-15 carbine castle nut lock the buffer tube down cleanly at the rear of the lower receiver. The SB Tactical SBA3 adjustable pistol stabilizing brace in black fits over the Mil-Spec 6-position buffer tube and closes out the rear end of the build with an adjustable length of pull and a well-regarded brace design trusted across the AR pistol platform.

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