We’re excited to introduce this heavy-duty 300 Blackout AR 15 Pistol Kit. Featuring an 8.5” nitride barrel, 7” lightweight M-Lok handguard, complete parts kit, and your choice of a quality forged or billet 80% lower, this kit includes everything you need to finish your build and hit the range in a single day.
A heavy-profile, 4150V barrel provides MOA accuracy and reliably cycles supersonic or subsonic 300 BLK loads, suppressed or un-suppressed. A 1:7 twist rate allows for accurate shot groups with either heavy (220-grain) or light (110-grain) loads. A pistol-length gas system and 5/8-24 thread fittings making installing your favorite suppressor a breeze, no modification necessary.
300 Blackout Pistol Kit Specs:
Barrel Length: 8.5″
Gas System: Pistol Length
Barrel Profile: Heavy
Barrel Steel: 4150V
Barrel Finish: Nitride
Chrome Lining: None
Muzzle Thread: 5/8-24
Chamber: 300 Blackout
Twist Rate: 1:7
Barrel Extension: M4
Diameter at Gas Block: .750
Gas Block Type: Low-Profile
Muzzle Device: A2 Style Flash Hider
Receiver Material: Forged 7075 T6
Receiver Type: M4
Handguard Type: 7″ Lightweight M-Lok Free Float Rail
Bolt Carrier Group Included: Yes
Bolt Steel: Carpenter 158
Bolt Carrier Profile: Full-Auto
Charging Handle Included: Yes
Overall Length: 17″
300 Blackout Pistol Kit Features:
- Offers complete build kit w/ optional 80% lower
- Is not considered a firearm, no FFL required
- Pre-built upper is test-fired for reliability
- Features mil-spec fittings
- Type III Hardcoat anodized
- Proudly made in the USA
- Backed by Lifetime Warranty
300 Blackout Pistol Kit Details:
Barrel: Nitride-coated, 8.5”, chambered in 300 Blackout. Made of 4150 Vanadium. Features 1:7 twist rate, M4 barrel extension, and pistol-length gas system. Includes 7″ Lightweight M-Lok free-float rail, .750″ diameter low profile gas block, and A2 flash hider.
Upper: Mil-spec, made of forged 7075 T6 aluminum. Hard-coat anodized (Type III). Features M4 feed ramps.
Bolt: Mil-spec, shot-peened, made of Carpenter 158 steel. Gas key secured with Grade 8 fasteners, staked per mil-spec. Parkerized exterior, chrome-lined interior.
80% Lower: Pick an optional forged or billet 80% lower. All lowers include mil-spec fittings and hard-coat anodizing.
Lower Parts Kit: Includes complete, mil-spec AR-15 parts kit. Features MOE trigger guard and Enhanced Polished Trigger (EPT).
Charging handle: Standard 7075 Forged charging handle.
Please note: If completing your AR Pistol Kit using the optional 80% lower, please select an 80 lower jig from our available options.
Shipping of various parts and/or accessories are prohibited to states and locales (ie New Jersey, California, New York, etc…) with restrictions against certain parts and/or accessories or “assault weapons” (i.e. states with high-capacity magazine restrictions, manufacturing of semi-automatic weapons, etc..). It is your responsibility to be aware of your local firearms laws before purchasing from our website or machining a firearm. We try our best to keep our shipping page current, but laws change daily
80-Lower.com only ships within the United States. Federal legislation dictates we cannot ship our products internationally.