The Batlskin Head Protection System has been designed so that it can be worn with all standard pieces of military equipment without limiting the user’s range of motion.
http://youtu.be/z1f9HW_eBQk
Here are instructions and methods that will allow you to see down the sights and optics of your weapon while wearing the Batlskin Head Protection System.
http://youtu.be/rNDFZjhFYeQ