I'm looking to order a red dot sight for my S&W .22A1 pistol and I just read on another topic:
http://smith-wessonforum.com/smith-wesson-semi-auto-pistols/65881-heads-up-red-dot-scope-s-w-22a-1-a.html
That I need a weaver style base and I'm just scared of ordering something that will be sent...