most people dont dip whole guns put together lol
they dip the frame of like a glock, or the plastic on an AR. Since most of the AR is plastic, you can dip most of the gun. I'd say it would be safe but pull all of the foam off first, because you dont want water clogging all the holes of the helmet. The dip covering the holes isnt a problem because you can just cut them with an exacto knife.