Certainly appears to be one... Might want to go ahead and get on the repair list for ECCO Machine to get that fixed...I hear they're like 12+ months out right now. Might as well get them to gut it, burn-in some new (better) baffles, cut that AAC mount off and thread it 1.375x24, and get it re-cerakoted while they got it, that way it will be like a brand new can, and you can run most any/all modern suppressor mounts from now on.