I've seen several guys shooting Glocks equipped with slide mounted Trijicon RMRs . How well do these optics stand up to the pounding they must take? Most race guns have their optic attached to the frame and I would guess part of the reason is to avoid the beating (as well as making target reacquisition faster). Anybody use this setup or know something about it? I'd like to try one just for fun. I really like the Burris Fast Fire II I have on my Ruger 22/45.