Details
Firestorm AR-15 Pistol Full Build Kit with SBA3 Brace, 8.5 Inch 300 Blackout
The Firestorm Full Build Kit is a complete AR-15 pistol component package chambered in .300 Blackout and built around an 8.5 inch 4150 CrMoV barrel with a phosphate finish and 1 to 8 twist rate. This kit covers the upper and lower component sets needed to complete an AR-15 pistol build, including the bolt carrier group, charging handle, lower parts kit, and buffer system. The upper receiver is a billet 6061 T6 aluminum design with a Type III hard coat anodized finish. Lower receiver not included.
Key Features
- 8.5 inch 4150 CrMoV barrel, phosphate finish, 1 to 8 twist
- 5 8x24 thread pitch with GI birdcage flash hider
- 7 inch M Lok handguard
- SB Tactical SBA3 adjustable pistol stabilizing brace, black
- Billet 6061 T6 aluminum upper receiver, Type III hard coat anodized
- Complete bolt carrier group, 9310 alloy steel, nitride finish
- AR-15 M4 mil spec charging handle
- Pistol length gas tube with low profile adjustable 0 750 gas block
- Mil spec lower parts kit, buffer tube, buffer, recoil spring, end plate, and castle nut included
Perfect For
- Builders wanting a complete .300 Blackout AR-15 pistol component package in one purchase
- Shooters assembling an 8.5 inch platform with a brace equipped setup
- Builders who already have a stripped lower receiver ready to pair with a full kit
Upper Receiver and Barrel
This kit includes a billet 6061 T6 aluminum upper receiver finished in Type III hard coat anodize. The 8.5 inch barrel is made from 4150 CrMoV with a phosphate finish, an HBAR profile, and a 1 to 8 twist rate. A pistol length gas tube pairs with a low profile adjustable 0 750 gas block. The GI birdcage flash hider carries a 5 8x24 thread pitch.
Handguard and Brace
The 7 inch M Lok handguard provides mounting space along the barrel. The SB Tactical SBA3 adjustable pistol stabilizing brace is included as part of this kit in a black finish. Together these components make up the exterior forend and rear support portion of the upper side build.
Bolt Carrier Group and Charging Handle
The complete bolt carrier group is made from 9310 alloy steel with a nitride finish. An AR-15 M4 mil spec charging handle is included alongside it. These two components round out the internal upper component set included with this kit.
Lower Parts Kit and Buffer System
This kit includes a mil spec AR-15 lower parts kit covering the internal lower receiver components. The buffer system includes a 6 position buffer tube along with a buffer, recoil spring, end plate, and castle nut.
Follow safe handling and manufacturer instructions. Ensure compliance with all applicable federal, state, and local laws. Lower receiver not included. Verify local laws regarding pistol braces.
