I had one do same thing. All of a sudden my groups really opened up. Could not figure it out. I took the break off and for some reason looked into the bottom to see some pieces had broke off. Factory brake.I had a muzzle brake break recently. One of the interior baffles fragmented. No obstructions, just came apart. I got it warrantied and the replacement was a new design, eliminating the piece that fragmented. So I’m guessing they’d had enough of them come apart to change the design.
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