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
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.