Airsoft-Legends Lexan Lens Protector (Reserve)

NOTE: Covers only the slide comes without confirmation. The attachment is available via the following link: http://www.airsoft-legends.nl/pirate-arms-pirate-arms-scope-protector.html
It often happens that when a BB hits the glass, there is a crack in the glass and to keep protecting the lens of your scope, then you will place a new sight glass on your protector.

This glass thus does not break upon impact of a BB and is therefore preferable to use for protecting one's scope.