P320 carry threaded barrel opinions

Hello everyone, I recently purchased a sig 4.6 inch threaded barrel for the p320 carry off a member of a forum. It was advertised as oem sig and as never used. The barrel arrived in a very beat up sig box which matched the barrels I have bought directly from sig. upon using the barrel it shot fine but I noticed that the comp I threaded onto it was a little loose like the barrel threads were slightly smaller. Also the writing on the barrel seems very weird to me. Anyone think the barrel is a counterfeit or an older model? Thanks in advance.