Hey guys. Had a friend that approached me about buying a couple guns. One was a standard Glock 43 (non x) but the other was a SIG P226. I have a copy of the blue book of guns that is dated (36th edition - 2015) but I had no idea there were so many variations of the P226. It has a serial starting with U61, which makes me think it was from 98-99 but haven’t found much more information. Any suggestions on narrowing down the serial to a particular model to see what it is worth? Thanks in advance!