Achieving perfect performance with .300 BLK is easy, if you buy the right upper. This 10.5” barreled assembly boasts a mil-spec (4150 CMV) barrel coated with a nitride finish, promising longer barrel life and MOA accuracy, especially compared to a chrome-lined barrel.
Inside, a pistol gas system and M16 BCG ensures you can reliably cycle light and heavy loads with no modification. 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
AR-15Lowerreceivers.com 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.