Hey, i recently found my self an Fn Fal after probably 40 hours of searching, and i tried to put a acog optic on it, but when i zoomed in there is no crosshair showing and the scope looked really weird, same goes for all the other optics you can put on the Fal, and yes i did put a battery in them and turned them on, i also tried putting the acog on my m4 and it worked perfectly. I googled it and it seems like there is a lot of people having this problem.