5.56mm NATO Pistol Upper Assembly - (10.5" Nitride Barrel & 9" Lightweight M-Lok Handguard)



Enjoy the best of the suppressed and unsuppressed worlds with this 10.5” AR-15 upper chambered in .300 BLK. It’s perfectly tuned to handle light and heavy loads with or without your favorite can threaded on the end. A mil-spec (4150 CMV) barrel with a nitride finish promises superb accuracy and longer barrel life. Out back, you’re getting a quality 7075 T6 forged upper with standard Picatinny rail. The free-float, 9” M-Lok handguard offers plenty of rail estate for your favorite irons and accessories. This upper ships preassembled, test-fired, and ready for the range with a Lifetime Warranty.

Barrel Features & Specs:

  • Barrel Length: 10.5″
  • Gas System: Pistol-Length
  • Barrel Profile: A2
  • Barrel Steel: 4150 CMV
  • 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: A2 Flash Hider
  • Overall length: 19.5”

Receiver Features & Specs:

  • Receiver Material: Forged 7075 T6 Aluminum
  • Receiver Type: Flattop M4
  • Handguard Type: 9” 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.