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  1. Trouble with muzzle device shims

    Black Rifles
    Also posted over at, but so far no response, so might as well cast a wider net... I've got a Radical Firearms 8.5" complete upper in 300BLK, and a SilencerCo Omega sitting on a shelf at the local FFL. The local dealer let me take all of the other goodies in the box except the can, so...