New here and wanted to get some feedback. I've read a bit on the HE finish on USPs and understand that this is the only finish the USPs have come in. Was there a change in the finishing process or was there a change in the manufacturing process for the slides? Here are two pictures of a USP 40 and USP 9, date code 1994 and 2016 respectively. They look different. I'm curious as to what changed.