To protect scopes I like to use the half inch to one inch of hardened glass that comes with them, you know, the lens of the scope itself. Seriously, fire a 500fps airsoft gun at the front of a scope, if the lens breaks I'll buy you a new scope! Aimpoints, ACOG's, ELCAN's, normal scopes, etc. all have super thick hardened glass. Only thing to worry about are holosights.
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