Grif, it doesn't just 'drop-in' for all. It didn't work for my XSE. It would require some fitting. Since that was going to be the case, then I was going to wait to get a smithy to put a Smith & Alexander or Brown piece in.
I, too, am rather new to fitting a BT safety, but understand the workings of the trigger, sear, etc. Can someone post pix of "fitting the arm" as quoted above and some directions?Does take fitting of the arm, and you should have an idea of what you're doing here (it is a safety). If not, have a smith fit it for you.