300 Blackout: If you wanna build a close-range hand cannon that'll put a hole in just about anything, you've found the right kit. This AR-15 Build Kit sports a heavy-barreled 7.5" upper forged from 4150V gun steel - the same stuff the U.S. Army loves. Inside, a full-auto M16 BCG goes to work with a pistol gas system, reliably cycling any light or heavy loads. Just swap the magazine and keep burning brass.
This kit also comes with a forged M4 upper with plenty of rail space for your favorite optics and irons. You also get a lower parts kit with an upgraded Magpul MOE grip and polished trigger, a complete buffer tube assembly with a pistol brace by SB Tactical, and your choice of one of our forged or billet 80% lower receivers! Pair with a jig and get your build kit finished in a single afternoon. Then, just hit the range!
300 Blackout Pistol Kit Specs:
Barrel Length: 7.5"
Gas System: Pistol Length
Barrel Profile: Heavy
Barrel Steel: 4150V
Barrel Finish: Phosphate
Chrome Lining: None
Muzzle Thread: 5/8-24
Chamber: 300 Blackout
Twist Rate: 1:8
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:
- Includes everything you need to complete your build
- Ships to your front door with no FFL or paperwork
- Heavy barrel and EPT Parts Kit provide sub-MOA accuracy
- Pre-built upper removes the guesswork of assembly
- Made in the U.S.A., backed by a Lifetime Warranty
300 Blackout Pistol Kit Details:
Barrel: Phosphate-coated, 7.5”, chambered in .300 AAC Blackout. Features 1:8 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 an 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: Includes an optional forged or billet 80% lower. Each lower features a mil-spec, hard-coat anodized finish and mil-spec fittings.
Lower Parts Kit: Includes complete, mil-spec AR-15 parts kit. Features Enhanced Polished Trigger (EPT).
Charging handle: Standard 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.