AR-15 Pistol Kit - .300 Blackout (8.5" Barrel, 1:8 Twist & 7" MLOK Handguard) with 80% Lower



So you're looking to build a new pistol length AR to add to your collection.  You chose .300 AAC Blackout, because of its ability to go super or subsonic and use a few different bullet weights.  No matter which velocity or grain of bullet you choose, you first and foremost chose the right AR pistol.

Big things come in small, pistol-sized packages.  This package gets you a prebuilt upper assembly complete with an 8.5-inch barrel and a 7-inch MLOK handguard.  You also get a lower parts kit, SB Tactical's SBA3 adjustable pistol brace, and a Magpul MOE grip and trigger guard.  And of course we finish this kit off with an 80% lower receiver of your choice, either forged, billet, or none.

AR-15 Pistol Build Kit Specs:

Barrel Length: 8.5″

Barrel Steel: Chrome Moly Vanadium

Barrel Finish: Phosphate

Muzzle Thread: 5/8 x 24

Chamber: .300 AAC Blackout

Twist Rate: 1:8

Muzzle Device: A2 Flash Hider

Receiver Material: 7075 T6 Forged Aluminum

Receiver Type: M4

Handguard Type: 7” Lightweight M-Lok

Bolt Carrier Group Included: Yes

Bolt Steel: Carpenter 158

Charging Handle Included: Yes

AR-15 Pistol Build Kit Features:

  • Complete build kit w/ optional lower
  • Includes pre-built .300BLK AR upper
  • High-quality CMV barrel for accuracy
  • Features enhanced, polished trigger
  • Not considered a firearm, no FFL required
  • Proudly built in the U.S.A.
  • Backed by Lifetime Warranty

Barrel: Phosphate-coated, 8.5”, chambered in .300BLK. Made of 4150 CMV steel. Heat-treated. Features 1:8 twist rate. Includes 7” M-Lok handguard, and A2 flash hider.

Upper: Made of 7075 T6 forged aluminum. Hard-coat anodized (Type III).

Bolt: Heat-treated. Nitride finish. Carpenter 158 steel.  Full auto profile.

80% Lower: Complete with optional AR-15 80% lower. Mil-spec fittings. Type III Hardcoat anodized finish.

Lower Parts Kit: Mil-spec AR-15 lower parts kit. Enhanced, polished trigger (EPT). Six-position buffer tube. SB Tactical Pistol Brace. Magpul MOE grip. Carbine buffer spring and pistol buffer.

Charging Handle: Standard AR-15 charging handle.

Please note: If completing your AR-15 build using the optional 80% lower, please select an AR-15-compatible 80% jig from the available options on our website.

No FFL required  Made in the USA  Lifetime Warranty

Shipping Restrictions only ships within the United States. Federal legislation dictates we cannot ship our products internationally. 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 (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. We try our best to keep our shipping page current, but laws change daily.

We are a national retailer of individual components and not all products depicted on this website are legal in every state. Shipping of various products found on this website are prohibited to some states (such as California, Connecticut, District of Columbia, New Jersey, New York, Rhode Island, and Washington). The information, pictures, text or products presented on this website are not a representation by us, and should not be understood by you, that any product or completed firearm is legal to assemble or own in your state of residence. We encourage each and every builder to perform their own research about the state and federal laws that apply to them. It is your responsibility to understand the law and we encourage you to consult with an attorney or your local ATF representative.