So I bought a Century Arms WASR 10/63 with the Romanian stamp on it (triangle with arrow in it) from Dunham's sporting goods a few weeks ago and being new and ignorant to owning an AK-47, I didn't think to check for matching serial numbers. I took it out shooting this past weekend and shot 100 rounds through it with absolutely no problems. Well my post-range cleaning session made me notice that not one of the rifle's internal parts are stamped with matching serial numbers. The only ones that match are the one on the front trunnion and the gas tube. The bolt carrier, bolt, and recoil spring thing each have different serials numbers. The shell casing that I found didn't have any unusal damage on it (shearing, dents, etc.), if that is any indication of a problem. I would really appreciate any advice regarding how big of a problem this could be, whether it's dangerous to shoot, legal issues, whether I should bring it up with the store, etc. Thanks in advance!