Just picked up one today. It is in the lower #57000's. Still has the Sept 14th date & no hammer block. For some reason the top latch won't close. The gun doesn't seem to have been worked on & the ears where it should latch are not shiny or worn, so it looks like it hasn't closed in a long time. I pulled the screw holding the latch & could that to go far enough to close, was just off a tiny amount. The gun is tight as new, but wasn't stored properly & has some surface issues. Any suggestions other than a smith?