Orbit w/SBA5 Brace 6-inch Pistol-Gas 1:7 .300 BLK AR-15 Freefloat M-Lok Handguard Pistol Full Build Kit

Orbit SBA5 Brace 6-inch Pistol-Gas 1:7 .300 BLK AR-15 Freefloat M-LOK Pistol Full Build Kit

The Orbit is a .300 AAC Blackout AR-15 Full Build Kit built around a compact 6-inch pistol-length gas platform. The kit centers on a 6-inch nitride barrel with a 1:7 twist rate and 5/8x24 thread pitch, paired with a .308 compatible muzzle-mounted fake suppressor. A micro low-profile steel gas block at 0.750 diameter and a pistol-length gas tube are included on the front end. The 7000 Series optimized AR-15 upper receiver carries a Type III hardcoat anodized black finish with a dust cover pin retention feature and an ejection port door assembly, paired with a 7-inch Blem freefloat M-LOK handguard featuring a full-length Picatinny top rail and integrated QD sling mounts. A USA-made complete AR-15 bolt carrier group compatible with .223 Remington, 5.56 NATO, .300 Blackout, and .350 Legend, 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 aluminum carbine buffer tube, a standard 3 oz AR-15 carbine buffer, a USA-made standard AR-15 carbine recoil spring, an AR-15 M16 Mil-Spec end plate, and an AR-15 carbine castle nut. The SB Tactical SBA5 adjustable pistol stabilizing brace in black is included. Lower receiver not included.

Key Features

• 6-inch nitride barrel, 1:7 twist, 5/8x24 thread pitch, .300 AAC Blackout
• Pistol-length gas system
• Pistol-length gas tube
• Micro low-profile steel gas block, 0.750
• Muzzle-mounted fake suppressor, .308 compatible, 5/8x24
• 7000 Series optimized AR-15 upper receiver, Type III hardcoat anodized black, dust cover pin retention feature, ejection port door assembly
• 7-inch Blem freefloat M-LOK handguard, full-length Picatinny top rail, integrated QD sling mounts, lightweight design
• USA-made complete AR-15 bolt carrier group, .223 Remington and 5.56 NATO and .300 Blackout and .350 Legend compatible
• Mil-Spec AR-15 M4 charging handle
• Complete Mil-Spec AR-15 lower parts kit
• Mil-Spec heavy-duty 6-position aluminum carbine buffer tube
• Standard AR-15 carbine buffer, 3 oz
• Standard AR-15 carbine recoil spring, made in USA
• AR-15 M16 Mil-Spec end plate
• AR-15 carbine castle nut
• SB Tactical SBA5 adjustable pistol stabilizing brace, black

Perfect For

• Builders sourcing a complete .300 AAC Blackout AR-15 pistol full build kit with a 6-inch nitride barrel, Type III hardcoat anodized upper receiver, USA-made BCG, 7-inch Blem freefloat M-LOK handguard with integrated QD sling mounts, and SBA5 adjustable brace on a Mil-Spec carbine buffer tube already included, pairing it with their own lower receiver at a Blem handguard price point
• Shooters building a compact 6-inch pistol-gas .300 BLK platform who want the USA-made BCG, charging handle, complete lower parts kit, and SBA5 adjustable brace covered in one kit with a full-length Picatinny top rail handguard and integrated QD sling mounts
• AR-15 pistol builders who want a .300 AAC Blackout full build kit with a muzzle-mounted fake suppressor at 5/8x24 and a 7-inch lightweight freefloat M-LOK handguard without sourcing components separately

Barrel and Muzzle Device

The 6-inch barrel is chambered in .300 AAC Blackout and finished in nitride. The twist rate is 1:7 and the thread pitch is 5/8x24, which matches the included .308 compatible muzzle-mounted fake suppressor. A micro low-profile steel gas block at 0.750 diameter and a pistol-length gas tube cover the front end gas configuration on this pistol-length platform.

Upper Receiver and Handguard

The 7000 Series optimized AR-15 upper receiver carries a Type III hardcoat anodized black finish with a dust cover pin retention feature and an ejection port door assembly. The 7-inch freefloat M-LOK handguard is a Blem unit featuring a full-length Picatinny top rail, integrated QD sling mounts, and a lightweight design, with M-LOK attachment points along the body for accessory mounting. Blem handguards may exhibit minor cosmetic imperfections that do not affect function.

Bolt Carrier Group and Charging Handle

The USA-made complete AR-15 bolt carrier group is compatible with .223 Remington, 5.56 NATO, .300 Blackout, and .350 Legend. 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 aluminum carbine buffer tube, a standard 3 oz AR-15 carbine buffer, a USA-made standard AR-15 carbine recoil spring, an AR-15 M16 Mil-Spec end plate, and an AR-15 carbine castle nut. The SB Tactical SBA5 adjustable pistol stabilizing brace in black pairs with the included Mil-Spec carbine buffer tube and covers 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.