If you want a nonmagnified optic, cant go wrong with the Aimpoint or EOtech. Both excellent electronic sights. If you want a little magnification, any scope made by a reputable company up to about a 2x-7x should work. On mine, I use a Burris Fullfield 3x-9x, but I use mine mainly for hunting at close to moderate ranges and prefer the 9x. Good luck.