300 Blackout AR 15 Pistol Kit (7.5” Phosphate Barrel & 7” M-Lok Handguard) W/ 80% Lower (1:8 Twist)



This .300 AAC Blackout Pistol Kit is perfect for shooters who want to affordably build a bomb-proof, compact AR Pistol. The included 7.5” heavy barrel is cold hammer-forged from mil-spec 4150V steel and sports a phosphate coating to improve barrel life and reducing corrosion. The pistol-length gas system perfectly handles light and heavy loads with no modification required. Just swap the magazine and keep workin’ the fun button.

A high-speed MOE lower parts kit with an Enhanced Polished Trigger (EPT) and SB Tactical Adjustable Pistol Brace completes the kit, making this pistol maneuverable and accurate. Each upper is test-fired to ensure proper operation and reliability.

This AR Pistol Kit includes all the components you need to complete your build, minus an 80 lower jig. Simply select whether you want a forged or billet 80% lower using the options to the right!

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.

No FFL required  Made in the USA  Lifetime Warranty

Shipping Restrictions

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.