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I do not have an M3, but if it’s anything like an M4 it’s important to thoroughly clean an properly lubricate before firing the new weapon. I ran my M4 pretty wet during break in. I’m assuming your M3 is new? Also, during break in I used high brass heavier loads, full power buck shot and slugs. Maybe you did all that already. Just thought I’d try to help to rule out typical break in stuff.