Just acquired a 639 and have seen some posts regarding upgrading the ambi-thumb-latch to gen-3 to be rid of the screw issues.
Can someone confirm that this can even be done?
I have also purchased a couple of SS slides from a local gun shop that are left-over from destroyed pro-hibs, (makes me want to cry to even say that here) one has left side only latch c/w Novak sight, and other has gen-3 ambi set-up with guarded adjustable sight. I think I could just switch slides around and leave the O.E.M. set-up alone, but was curious if anyone had made the switch.
Thanks in advance, Shaun

Welcome to the froum from Arkansas and you need to post the question in the right sub group for an answer.

Thank you sir.
Appreciate the advice. Was pre-occupied and greenhorn to boot.
Looking forward to enjoying this site.