AR15 Pistol Kit - .300 AAC Blackout (10.5" Phosphate Barrel, 1:8 Twist & 12" Slanted M-Lok Handguard) with Fire/Safe Marked 80% Lower



Looking for the perfect 300 Blackout setup for your AR-15 build? The good ole' whisper round can be finnicky, especially when it comes to velocity and twist rate. So, we branched out into shorter-barreled kits to satisfy the .300 BLK's fickle behavior. Sporting a 10.5" barrel made from mil-spec 4150 CMV with a 1:8 twist rate, this is the kit you want for MOA accuracy with light and heavy loads. Rounding out this badass kit is a forged M4 upper with loads of rail space for optics and irons.

Inside, you're getting the best of the best: An enhanced trigger kit, a full-auto, staked and chrome-lined M16 BCG, and a pistol-length gas system for ultimate reliability. Out back, an SB Tactical pistol brace, full buffer system, and optional billet or forged 80% lower complete the kit. Pick up an 80% jig and you'll have everything you need to turn this box of parts into a range-ready shooter! The upper ships prebuilt and test-fired, and everything's backed by a Lifetime Warranty.

300 Blackout Pistol Kit Specs:

Barrel Length: 10.5"

Barrel Profile: A2

Gas System: Pistol-length

Barrel Steel: 4150 Chromoly Vanadium

Barrel Finish: Phosphate 

Chrome Lining: No

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: PSA Fluted Flash Can

Receiver Material: Forged 7075 T6 Aluminum

Receiver Type: M4

Handguard Type: PSA 12" Slant End M-Lok Rail

Bolt Carrier Group Included: Yes

Bolt Steel: Carpenter 158

Bolt Carrier Profile: Full-auto

Charging Handle Included: Yes

Overall Length: 21"

300 Blackout Pistol Kit Features:

  • Includes all parts needed to complete build
  • Optional forged or billet 80% lower
  • Upper ships pre-built and test-fired
  • Enhanced, polished trigger for reliability
  • Not considered a firearm, no FFL required
  • Proudly built in the U.S.A.
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, New Jersey, New York, Pennsylvania, 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.