I am looking my Yugo M59/66A1 over real well, and I noticed that the barrel and receiver don't match. And all the parts are stamped with the receivers serials and then electro penciled with the barrels numbers. Why is this? It's a Century import, could it have to do with the monkeys there? The receiver is a brownish-plum color and is weathered. The barrel is black. So I guess it was rebarreled. It's a 1975 with its fair share of nicks and scratches. Thanks!