Optimized for subsonic accuracy.
Featuring a 7.5" heavy barrel with a 1:8 twist rate, this 300 Blackout AR-15 upper provides the perfect combination of parts and specifications to ensure all subsonic loads are stabilized for maximum accuracy. Included is an upgraded, custom billet upper with a side-charging bolt carrier group for improved ergonomics.
What’s Included
This is not a firearm. It includes an assembled upper receiver, bolt carrier group, and charging handle.
300 BLK Pistol Upper Assembly Specs
Barreled uppers are assembled in-house before shipment.
Barrel
- Chamber: .300 AAC Blackout
- Contour: Heavy
- Length: 7.5"
- Twist Rate: 1:8
- Gas System: Pistol
- Gas Block: 0.750"
- Muzzle Threads: 5/8x24
- Feed Ramps: .30 Cal
- Material: 4150 CMV
- Finish: Parkerized
- Process: Button Rifled
- Lining: None
- Extension: M4
- Muzzle: Fluted Flash Hider
Handguard
- Attachment System: 6.5" M-LOK
- 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: Billet 6061-T6 Aluminum
- Finish: Type III Hardcoat Anodized (Mil-Spec)
Bolt Carrier Group
- Profile: M16/Full-Auto
- Steel: AISI E9310
- Exterior: Black Nitride
- Interior: Black Nitride
- Gas Key: Staked
- Charging Handle: Included, Right Side Charging
Lower receiver assembly sold separately.
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:
- 7.5"
- Barrel Finish:
- Parkerized
- Twist Rate:
- 1/8
