OK, Bob started this!
The 625 to get is the 625-6 MG. That's the last Mountain Gun that was pre-lock, pre-MIM. And yet it was made right when they were making the modern improvements. The book will cross you up on this one. The 625-6 MG in .45 Colt was made in 1996. Hammer mounted firing pin, no MIM. But the regular 625 went to the -6 revision the next year and it went to the frame mounted firing pin and MIM parts. That's S&W.
Anyway, the S&W 625-6 MG in .45 Colt made in 1996 was my Grail gun for a long time. Buy it, then have it converted to use moon clips. Then you have a gun that can shoot normal .45 Colt singles just as before. It can also shoot .45 Colt with clips. But now it will also shoot .45 ACP with moon clips. Which is the way I shoot mine 95% of the time. The only real downside I've discovered is much different POI between a .45 ACP 230 FMJ load vs a .45 Colt 250 grain hard cast Keith bullet! So much so that I basically use the gun almost totally in .45 ACP. It's nice to know that I could switch it over to .45 Colt if I wanted to use it that way but it was the fun with moon clips that I really wanted. Great fun gun. It's one of the guns people always want to try at the range.
Gregg