Please note: We strive to provide the most accurate photographs of our product wherever possible. Due to availability limitations and supply chain constraints, slight variations of the handguard of this upper assembly may occur in the aesthetics of the skeletonizations in between the M-Lok sections.
For the long-range shooter who demands a do-it-all AR with a .30-cal. This 300 Blackout upper assembly provides a lightweight rifle that can shoot suppressed or un-suppressed with supers and subs all day (and night, for the hogs). With a 16" barrel forged from 4150 CMV with a 1:8 twist providing optimal velocity and stability for all grains and loads, this assembly yields MOA accuracy in any configuration.
What’s Included
This is not a firearm. It includes an assembled upper receiver, bolt carrier group, and charging handle.
300 BLK Upper Assembly Specs
Barreled uppers are assembled in-house before shipment.
Barrel
- Chamber: .300 AAC Blackout
- Contour: Heavy
- Length: 16”
- Twist Rate: 1:8
- Gas System: Pistol
- Gas Port: 0.750”
- Gas Hole Dia.: 0.070”
- Muzzle Threads: 5/8x24
- Feed Ramps: M4
- Material: 4150 CMV
- Finish: Parkerized
- Process: Button Rifled
- Lining: None
- Extension: M4
- Muzzle: A2 “Birdcage” Flash Hider
Handguard
- Attachment System: 15" 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: 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
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
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GunBuilders.com only ships within the United States. Federal legislation dictates we cannot ship our products internationally.
