16" 300BO Barreled Upper Receiver Assembled 1:7 Pistol Gas System

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Product Type: Discontinued
Manufacturer: ACME Machine
SKU: 05-305     UPC:

Product Description

High quality, lightweight Upper Receiver is made of 7075-T6 Forged Aluminum. Made in the U.S.A. This kit includes our standard Ejection Port Cover and Forward Assist Kit Assembled.

300 Blackout barrel is 4150 chrome molly, black phosphate finished, pistol length gas system, 1:7 twist, 5/8x24 threaded, 0.093 gas port, M4 feed ramps, 0.750 gas block journal. HBAR profile.

NO BCG or Charging Handle


  • 7075-T6 Forged Aluminum
  • Black Anodized finish
  • Flat-Top with Picatinny rails
  • Mil-Spec dimensions
  • Made in the U.S.A.
  • Assembled Upper Receiver
  • Pistol Gas Tube
  • .750 Low Profile Gas Block