Bought my first O/U yesterday -- a used traditions 20ga -- got home and did a really good inspection. Found that the barrell has a minute amount of creep when locked into firing position. By minute I mean definately less than 1/32 of an inch and have to be holding up past the forearm to get enough leverage to do it. Took me a long time to determine barrell lock-up vs. loose stock. So I am wondering:

1. is this common to O/U's
2. is it due to manufacture or use
3. could it get worse and how much (will probably shoot hundreds vs. thousands of rounds per year)

Need to make a decision ASAP on whether to keep the gun or return. Thanks!