This full build kit provides all components needed to complete a 300 BLK AR-15 build except the lower receiver. It includes an 8.5 inch barrel with pistol gas system, M-Lok freefloat handguard, complete bolt carrier group, charging handle, buffer system, lower parts kit, and SB Tactical SBA3 adjustable stabilizing brace. The upper receiver is forged 7075-T6 aluminum with anodized finish. The barrel is 4150 Chrome Moly Vanadium with 1 in 9 twist rate and 5/8x24 threads.
This kit includes the upper assembly, bolt carrier group, charging handle, buffer tube assembly with pistol buffer and spring, lower parts kit, and stabilizing brace. All components required to complete an AR-15 pistol build are provided except the lower receiver.
The SBA3 stabilizing brace features an adjustable design with multiple length of pull positions. The brace is paired with a Mil-Spec heavy duty pistol buffer tube assembly for compatibility with standard AR-15 buffer systems.
The 8.5 inch heavy profile barrel is chambered in 300 BLK with a 1 in 9 twist rate. The pistol gas system is matched to the barrel length. The barrel features 5/8x24 threads with an included GI birdcage flash hider.
The bolt carrier group features an 8620 alloy steel carrier with nitride finish for corrosion resistance and surface hardness. The BCG is paired with a Mil-Spec AR-15 M4 charging handle for complete upper functionality.
Lower receiver not included. Follow safe handling and manufacturer instructions. Ensure compliance with all applicable federal, state, and local laws.
Caliber: .300 Blackout
Barrel Length: 8.5-inch
Barrel Material: 4150 Chrome Moly Vanadium
Barrel Thread Pitch: 5/8x24
Barrel Gas System Length: Pistol
Barrel Twist Rate: 1:8
Barrel Profile: Heavy
Barrel Finish: Parkerized
Upper Receiver Material: 7075-T6 Aluminum
Upper Receiver Finish: Anodized
Handguard Material: 6061-T6 Aluminum
Handguard Color: Black
Handguard Style: M-Lok
Gas Block Size: 0.75
Gas Block: Micro Low-Profile Gas Block
Muzzle Device: GI Birdcage Flash Hider
Muzzle Thread Pitch: 5/8x24
Charging Handle: AR-15 M4 Charging Handle Mil-Spec Quality
Bolt Carrier Material: 8620 Alloy Steel
Bolt Carrier Finish: Nitride
Buffer Tube: Mil-Spec Heavy-Duty 6-Position Buffer Tube
Buffer Spring: Standard AR-15 Carbine Recoil Spring
Buffer Weight: 3 oz.
Brace: SB Tactical SBA3 Adjustable Pistol Stabilizing Brace
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