Thanks for the feedback guys. I figured the screen would still crack if I stick it onto the lense since phone screens are flexible but scopes are not.
I will probably go with the plexi / lexan path, although would they affect visibility when playing dim cqb arenas? I heard they are very transparent and shouldn't be too much of a problem.... what are your thoughts?
IF anything how about a scope protector attachment like these:
http://www.ebay.com/itm/Aim-Sports-T...-/231312003705