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.300 AAC Blackout Upper Assembly - (7.5" Nitride Barrel & 9" Lightweight M-Lok Handguard)



This 7.5” .300 BLK AR-15 upper’s perfect for building the ultimate personal defense weapon, range toy, or compact medium-to-close-range shooter. Featuring a mil-spec heavy barrel made from 4150 CMV, this upper promises superior accuracy and barrel life. The included nitride finish offers longer barrel life than a chrome-lined finish with better precision. Finishing off this upper is a mil-spec, forged 7075 T6 flattop upper and a lightweight, free-float M-Lok handguard. This upper ships test-fired and is backed by a Lifetime Warranty. Pair with a buffer system, 80% lower, and lower parts kit, and you'll have all the parts you need to complete this upper as a new pistol or SBR!

Barrel Features & Specs:

  • Barrel Length: 7.5″
  • Gas System: Pistol Length
  • Barrel Profile: Heavy
  • Barrel Steel: 4150 CMV
  • 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: Fluted Flash Can

Receiver Features & Specs:

  • Receiver Material: Forged 7075 T6 Aluminum
  • Receiver Type: Flattop M4
  • Handguard Type: 9” Lightweight M-Lok Handguard
  • Bolt Carrier Group Included: Yes
  • Bolt Steel: Carpenter 158 Steel
  • Bolt Carrier Profile: Full-Auto (M16)
  • Charging Handle Included: Yes 
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 only ships within the United States. Federal legislation dictates we cannot ship our products internationally.

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, Hawaii, 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.