Howdy I picked up this Norinco on a craigslist trade for a broken tv. Obviously I need to give a shout to the sheriff's department and make sure it isn't stolen...but can anybody help me ID this s/n please? It's an early Chinese model I believe. The receiver is milled, and the trigger guard is stamped. Matching numbers on literally EVERY part including the stock. I've heard of "DP".....but never "DB". Any clues would be much appreciated!!