[El Cactus Loco]

ask yourself this:
if you get a real gun optic, do you really want to risk a bb destroying it?
do yourself a favor, get a kill flash, or eotech screen protector, or whatever your sight needs.
also i generally say if you can afford a real optic, go for it. they will depreciate much more slowly than a replica, so you can sell them really easily if you ever need to, and its one of the few accesories you can buy that you actually use every time you fire the gun.