Hi guys,
New to the forum. I have a Model 645 stainless purchased in 1985, (8 in the clip and 1 in the chamber) and I foolishly dropped it in my driveway and broke off half of the rear sight. My question is where can I get a replacement, (maybe a fancy glow in the dark kind; or not!) and how do I remove the old sight and install the new one?
Thanks in advance to anyone who can help.

Hello and Welcome to the Forum,
I can't help you with an answer, but I'm quite sure if you pose this question in the gun smithing forum on this site, you will get your answer. Good luck with your 645, they are excellent pistols.

Midway sells them pretty reasonable, S&W may replace under their lifetime warranty.

Rear Sight (Fixed) Gun Parts | 353340 | Numrich Gun Parts

Thanks guys.