Had a B-Square saddle mount on my 9200. Worked well, but very tricky to get mounted right. Overtighten the mounting screws and you pinch the receiver, which causes all kinds of feeding issues. Not tight enough and the mount moves. YOU GOT TO GET IT JUST RIGHT and only then it lasts until you bump it just right and have to start all over again. Needless to say I went to a 835 and Truglo fiber optics.
A good gunsmith can drill and tap easy.