ive had the jg g36c for almost a week now(can't keep my hands off it), and i can fire it pretty friggen fast in semiauto, just let go of the trigger all the way. and as for your flip-up sight prob: just move it a bit to the left/right with an allen key, but imho you should get a reflex for it, i don't like the irons
ive already fired over 2250 rounds from mine and i am in need of silicone it seems lol