Quick legal question regarding serial engraving. If building an AK from a parts kit that has...say a serial on the front trunnion or bolt carrier..or anywhere, can the same serial be engraved on the US made receiver to match? it will be a 922r compliant rifle that will be made in the US. Im thinking if there is a number on the trunnion and I make up my own number for a homebuild receiver, couldn't this confuse authorities if they would look at it? I also read misleading info on "if no serial is on the receiver but on the trunnion, then that counts as the serial" but as a US build receiver, wouldn't it need its own "different" serial?