A buddy of mine has one in an AR and loves it. Out to about 400 or so yards it is awesome but hits with my .223 are easier at 600yards. The wind wreaks havoc on those tiny bullets at that range, a minor miscalculation and you won't hit crap!
Courage is just fear that has said it's prayers.
The people trying to say the 2nd Amendment is outdated are probably the same folks that would say the same thing about the Bible.