I've tried to do some searching on this subject, but can't seem to find a definitive answer. I have recently purchased my 590 and have 225 shells through it. I have had some problems running some Winchester cheap target loads, as in the gun locks up. Upon cleaning, I discovered some pretty serious gouge marks in the top of the receiver. These are deep enough to feel when cycling the action. When you cycle the action, the bolt hangs up where these gouge marks are. I did my best to measure the depth at .06-.08". My Maverick has 300+ rounds through it without this type of wear. HAs anyone else seen this and should I send the gun to Mossberg? I am attaching the finest cell pic I can get....Please Help!