Best prism optic for the price, period - Burris AR-332 3X - 32mm Prism Sight & Free FastFire 3 Red Dot Sight

I bought this optic over five years ago. Sighted it in for a 50/200 yard zero. Haven't changed the batteries out yet, mainly because the black reticle is easily picked up, even with my 58 year old, slightly astigmatic eyes. I've even moved this optic on and off my AR-15, and it still holds zero. I will change out the battery soon, if only to ensure it hasn't corroded. The battery still works well, in both red and green configurations. Rugged, accurate, and if you set eye relief right, i.e, rail mount and adjustment of your stock it won't let you down. Makes shooting with both eyes open a breeze at distance, and close quarters. The only con, and it's minor is you should definitely loctite the mount to the optic, in addition to the rail mounts to prevent it from falling off the rifle.