I put a Burris reflex red dot on my Sabatti, made a base from 6061 aluminum that screws to the rear holes for the scope base, not using the block supplied with the reflex site. It sits low on the mono block and gives me extremely fast target acquisition. I was really Leary of doing it, but now I like it. If you use that type of site be sure to get one with battery access on top and a on/off switch otherwise you have to remove the site to change battery, and I'm not sure it will return to zero when you do.
Bob