Yankee Hill Machine Company 9.1" .300 AAC Blackout Barrel

Yankee Hill Machine

  • This Yankee Hill Machine Company barrel features a 300 AAC Blackout Chamber. Constructed of 4140 chrome moly steel with a threaded muzzle, the barrel is Melonited for ultimate surface protection. The melonite coating provides a thinner surface than chrome-lining, so bore friction is reduced for better accuracy. In addition, melonite is harder than chrome-lining providing a longer wear life.

    Our .300 BLK barrels are designed to perform with both subsonic (220 and 208 gr) and supersonic loads. The gas port has been tuned to lock the bolt open on the last round when using subsonic ammunition with a sound suppressor or supersonic ammo without a suppressor. The bolt may not lock back when using subsonic ammunition WITHOUT a sound suppressor installed. Please note that subsonic ammunition can be more prone to malfucion than supersonic ammunition.


  • Length: 9.1"
    Weight: 1.1 lbs
    Material: 4140 Chrome Moly Steel
    Chamber: 300 AAC Blackout
    Twist Rate: 1:7
    Chrome Lined: No
    Finish: Melonite QPQ
    M4 Feed Ramps: Yes
    Muzzle Thread Pattern: 5/8"-24
    Gas Port Location: Pistol
    Exterior Diameter at Gas Port: .750"
    Additional Information Provided
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