Reach out and strike steel at the maximum theoretical distance 300 BLK can afford, thanks to this match-grade, stainless, fluted, heavy-barreled upper assembly.
The 416R forged barrel measures 16" to maximize muzzle velocity and hit probability -- and you get to avoid the SBR tax stamp you'd normally deal with when configuring the typical .300 BLK stubby gun.
This upper ships assembled and ready to install on any finished lower receiver assembly (sold separately).
What’s Included
This is not a firearm. It includes an assembled upper receiver, bolt carrier group, and a charging handle.
300 BLK Upper Assembly Specs
Barreled uppers are assembled in-house before shipment.
Barrel
- Chamber: .300 AAC Blackout
- Contour: Heavy, Straight Flutes
- Length: 16”
- Twist Rate: 1:8
- Gas System: Carbine
- Gas Port: 0.750”
- Muzzle Threads: 5/8x24
- Material: 416R Stainless
- Finish: Nitride
- Lining: Stainless
- Extension: M4
- Muzzle: Twisted Flash Hider
Handguard
- Attachment System: 12" M-Lok w/ Split Top Rail
- Finish: Type III Hardcoat Anodized (Mil-Spec)
- Top Rail: M1913 Picatinny
- Material: Billet 6061-T6 Aluminum
- Attachment: Barrel Nut
Upper Receiver
- Profile: M4 Flattop
- Material: Forged 7075-T6 Aluminum
- Finish: Type III Hardcoat Anodized (Mil-Spec)
Bolt Carrier Group
- Profile: M16/Full-Auto
- Steel: 9310 Tool, HPT/MPI-tested
- Exterior: Black Nitride
- Interior: Black Nitride
- Gas Key: Staked
- Charging Handle: Included
Lower receiver not included.
WARNING: Handling firearms parts and accessories can expose you to lead and other petroleum products known to the State of California to cause cancer and reproductive harm. For more information go to: www.P65Warnings.ca.gov
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.
- Platform:
- AR15
- Caliber:
- .300 AAC Blackout
- Barrel Size:
- 16"
- Barrel Finish:
- Nitride
- Twist Rate:
- 1/8
