Details
Aegis 8.5-Inch Pistol-Gas 1:8 .300 BLK AR-15 Free-Float M-LOK Handguard Pistol Full Build Kit with SB Tactical SBA5 Brace, Suppressor Ready
The Aegis Full Build Kit is built around an 8.5-inch .300 Blackout barrel machined from 4150 chrome moly vanadium steel in a heavy profile, with a pistol-length gas system and a Parkerized finish. It is paired with a black M-LOK handguard machined from 6061-T6 aluminum and an SB Tactical SBA5 pistol stabilizing brace molded from nylon-reinforced polymer. The kit ships with a complete bolt carrier group rated for 5.56, .223, .300 Blackout, and .350 Legend, an aluminum mil-spec charging handle, and a mil-spec heavy-duty six-position buffer tube with a 3-ounce buffer. The short, heavy barrel keeps the front end compact and sturdy, and the 1:8 twist suits a wide range of bullet weights in .300 Blackout. Lower receiver is not included. Lower parts kit, pistol grip, recoil spring, castle nut, end plate, and muzzle device details were not supplied with this listing.
Key Features
- 8.5-inch heavy profile barrel, 4150 chrome moly vanadium steel, Parkerized finish, 1:8 twist, .300 Blackout, 5/8x24 muzzle threads
- Pistol-length gas system with a micro low-profile gas block sized for a .750-inch barrel
- 7075-T6 aluminum upper receiver, anodized finish
- M-LOK handguard, 6061-T6 aluminum, black
- Complete AR-15 bolt carrier group (5.56/.223/.300/.350), 9310 alloy steel carrier, Nitride finish
- Aluminum mil-spec AR-15 charging handle included
- Mil-spec heavy-duty six-position buffer tube and 3 oz. buffer
- SB Tactical SBA5 pistol stabilizing brace, nylon-reinforced polymer
- Suppressor ready
- Lower receiver is not included.
Barrel and Gas System
The 8.5-inch barrel is machined from 4150 chrome moly vanadium steel in a heavy profile and chambered in .300 Blackout, with a 1:8 twist rate suited to a wide range of bullet weights in this cartridge. It is finished in Parkerized black, a matte, corrosion-resistant treatment that gives it a clean, uniform look. The barrel runs a pistol-length gas system through a micro low-profile gas block sized for a .750-inch barrel, and the 5/8x24 muzzle threads accept a compatible muzzle device. A muzzle device is not listed with this kit.
Upper Receiver and Handguard
The upper receiver is machined from 7075-T6 aluminum with an anodized finish, giving it a hard, wear-resistant surface that holds up to regular handling. It is paired with a black M-LOK handguard machined from 6061-T6 aluminum, and the M-LOK slots give the builder room to mount lights, grips, handstops, and other accessories wherever the setup calls for them.
Bolt Carrier Group and Charging Handle
The included complete bolt carrier group is rated for 5.56, .223, .300 Blackout, and .350 Legend, with a carrier machined from 9310 alloy steel and finished in Nitride, a surface treatment that adds hardness and corrosion resistance and helps the carrier stand up to repeated cycling. It is paired with an aluminum mil-spec AR-15 charging handle, completing the upper so it is ready to be matched with a compatible lower receiver.
Buffer System and Brace
The kit includes a mil-spec heavy-duty six-position buffer tube and a 3-ounce buffer. An SB Tactical SBA5 pistol stabilizing brace, molded from nylon-reinforced polymer, is included and is built to mount to a mil-spec carbine buffer tube like the one supplied in this kit.
Compatibility
This kit is built for AR-15 lower receivers and .300 Blackout builds. Lower parts kit, pistol grip, recoil spring, castle nut, and end plate inclusion, as well as handguard length and free-float configuration, feed ramp style, and ejection port door and forward assist configuration, were not supplied with this listing and should be confirmed before purchase.
Follow all manufacturer instructions and safe handling practices.
Ensure compliance with all applicable federal, state, and local laws.
