firearm vs clone sight?
 

Exactly what is the main difference between the two? I know price and authenticity is an obvious one but how about quality, function, and durability? Does clone one actually replicate everything the real one does? like EOtech's sight have it change position when you look at different angle.

real can take the violent shaking of a real weapon firing, clones rarely can.

does real one can take 450fps bbs? or it still needs a protective lens?

I can make any optic take any FPS of a BB... You could fire a 5000 FPS (FIVE THOUSAND) BB at my protectors and all that would happen would be the BB shattering.

So, click the link in my signature.

Thats 172 ft/lbs or 223 joules of energy.

That's about the same as a .22 with a 40-grainer going 1400FPS.

Do you guarantee this or my money back? :P

Really though if your spending big money on optics protectors are a good idea.

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.

to add to El cactus Loco its also the kind that can be used on after other rifle you have.