I have a 9 full size without the manual safety. I have an apex trigger on the way, and I am teaching my wife to shoot. Id like to have the added safety on the range and in the home. I can't find the manual safety on s&w website, but I got to thinking I know plenty of people buy them with safety's only to take them out. What are my chances of finding someone who has pulled theirs out and buying from them? Any compatibility issues? Or if anyone knows were I could buy one from cheaper than retain that would be nice, thank you.