Oh, and I believe most of the electronic aiming devices on combat equipment can be bypassed, looked around or removed if it fails leaving you with the open sights on the weapon. I'm sure these things are not solely relied upon in a life and death situation.

Something else to consider is you can shoot with them just fine even if the dot isn't on, it just won't be as accurate. I have shot both firearms and bows with the dot off. Just center your target in the scope and you will pretty close.

Paul