Davidson Defense Lockjaw w/SBA5 Brace 7.5-inch 1:16 10MM AR-15 Freefloat Tubular Handguard Pistol Full Build Kit

Lockjaw SBA5 Brace 7.5-inch 1:16 10mm AR-15 Freefloat Tubular Handguard Pistol Full Build Kit

The Lockjaw is a 10mm AR-15 pistol caliber Full Build Kit built around a compact 7.5-inch platform. The kit centers on a 7.5-inch M4 contour barrel in 4150 CMV steel with a Parkerized finish, 1:16 twist rate, and 9/16x24 thread pitch, paired with a 10mm and .40 S&W compatible A2 birdcage flash hider in black and a black 5/8-inch crush washer. The upper receiver is a 6061 billet PCC upper receiver in 6061 aluminum, paired with a 7-inch MFFAR7 smooth freefloat handguard in black aluminum with a full-length Picatinny rail. A PCC AR bolt assembly compatible with 10mm and .40 S&W and a Mil-Spec AR-15 M4 charging handle complete the upper side. The lower hardware includes a complete Mil-Spec AR-15 lower parts kit, a Mil-Spec heavy-duty 6-position buffer tube, an 8 oz 9mm buffer in black, a USA-made standard AR-15 carbine recoil spring, an AR-15 M16 Mil-Spec receiver end plate, and an AR-15 carbine castle nut. The SB Tactical SBA5 adjustable pistol stabilizing brace in black reinforced polymer with ambidextrous QD sling sockets is included. Lower receiver not included.

Key Features

• 7.5-inch M4 contour barrel, 4150 CMV steel, Parkerized finish, 1:16 twist, 9/16x24 thread pitch
• A2 birdcage flash hider, black, 10mm and .40 S&W compatible, 9/16x24, black 5/8-inch crush washer included
• 6061 billet PCC upper receiver, 6061 aluminum
• MFFAR7 7-inch smooth freefloat handguard, black aluminum, full-length Picatinny rail
• PCC AR bolt assembly, 10mm and .40 S&W compatible
• Mil-Spec AR-15 M4 charging handle
• Complete Mil-Spec AR-15 lower parts kit
• Mil-Spec heavy-duty 6-position buffer tube
• 8 oz 9mm buffer, black
• Standard AR-15 carbine recoil spring, made in USA
• AR-15 M16 Mil-Spec receiver end plate
• AR-15 carbine castle nut
• SB Tactical SBA5 adjustable pistol stabilizing brace, black reinforced polymer, ambidextrous QD sling sockets

Perfect For

• Builders sourcing a complete 10mm AR-15 pistol full build kit with a billet PCC upper, SBA5 adjustable brace, and 8 oz 9mm buffer already included, pairing it with their own lower receiver
• Shooters building a compact 7.5-inch 10mm pistol caliber platform who want the bolt assembly, buffer system, and SBA5 adjustable brace with ambidextrous QD sling sockets covered in one kit
• AR-15 10mm builders who want a 7-inch MFFAR7 smooth freefloat handguard with a full-length Picatinny rail and complete lower parts kit included without sourcing components separately

Barrel and Muzzle Device

The 7.5-inch M4 contour barrel is chambered in 10mm and constructed from 4150 CMV steel with a Parkerized finish. The twist rate is 1:16 and the thread pitch is 9/16x24, which matches the included A2 birdcage flash hider compatible with 10mm and .40 S&W. A black 5/8-inch crush washer is included with the muzzle device.

Billet PCC Upper Receiver and Handguard

The 6061 billet PCC upper receiver is 6061 aluminum, purpose-built around the AR-15 pistol caliber platform. The MFFAR7 7-inch smooth freefloat handguard is black aluminum with a smooth exterior profile and a full-length Picatinny rail for optic and accessory mounting. These two components define the exterior structure of the upper assembly on this 10mm platform.

Bolt Assembly and Charging Handle

The PCC AR bolt assembly is compatible with 10mm and .40 S&W on this platform. A Mil-Spec AR-15 M4 charging handle is included to complete the upper component set.

Lower Parts Kit and Buffer System

The complete Mil-Spec AR-15 lower parts kit covers the internal lower receiver components. The buffer system includes a Mil-Spec heavy-duty 6-position buffer tube, an 8 oz 9mm buffer in black, a USA-made standard AR-15 carbine recoil spring, an AR-15 M16 Mil-Spec receiver end plate, and an AR-15 carbine castle nut. The SB Tactical SBA5 adjustable pistol stabilizing brace in black reinforced polymer features ambidextrous QD sling sockets and pairs with the included Mil-Spec 6-position buffer tube, covering the rear brace interface for this pistol lower build kit.

Follow safe handling and manufacturer instructions. Ensure compliance with all applicable federal, state, and local laws. Lower receiver not included. Verify local and state laws regarding pistol brace use and classification.