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5.56mm NATO Pistol Upper Assembly - (10.5″ Nitride Barrel & 12″ Slanted M-Lok Handguard)



This .300 BLK-chambered, 10.5” AR-15 upper is the ticket to building the ultimate suppressed shooter with medium-range accuracy. A mil-spec (4150 CMV) barrel with nitride finish greatly enhances barrel life and affords top-tier accuracy with heavy or light loads. Thread on your favorite suppressor and hit the range. No modification is required to swap rounds. Inside the mil-spec 7075 T6 receiver, a carbine gas system and Full-Auto (M16) BCG with M4 feed ramps keeps things running smoothly. This upper ships fully assembled and test-fired, and is backed by a Lifetime Warranty. 

Barrel Features & Specs:

  • Barrel Length: 10.5″
  • Gas System: Carbine-Length
  • Barrel Profile: A2
  • Barrel Steel: 4150CMV
  • Barrel Finish: Nitride
  • Chrome Lining: None
  • Muzzle Thread: 1/2-28
  • Chamber: 5.56 NATO
  • Twist Rate: 1:7
  • Barrel Extension: M4
  • Diameter at Gas Block: .750
  • Gas Block Type: Low-Profile
  • Muzzle Device: KAK Industries Flash Can

Receiver Features & Specs:

  • Receiver Material: Forged 7075 T6 Aluminum
  • Receiver Type: Flattop M4
  • Handguard Type: 12” Lightweight M-Lok (Free-Float)
  • 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.