From everything I have read, this is a quality item. Remember, though, that an optic placed that far forward will require you to consider eye relief as an issue. That eliminates most traditional magnification scopes. If you go this route, have a look at some red dot & reflex style optics instead...
(Oh, I think it's compatible with all stocks, so you shouldn't have to invest in a new stock unless you just want to go with the 100% tactical look.)