Anyone here running an AAC 51T muzzle brake on their Remington 5R? The blackout flash hider does not fit over the outside diameter of the barrel, and therefore requires the barrel to be contoured for installation. Looking at the muzzle brake though, it appears that it fits right up against the barrel shoulder/shims and would not require any modification to the barrel. Is this correct or does the brake require the same work to barrel?
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