A little more info on 50/200 yard AR zeroing . Includes a link ( Post 3 by nickdrak ) to a very good 25/50/200 target that can also be used for 25/100.
Easy way to zero your rifle - M4Carbine.net Forums
Here's a direct link to the target:
http://www.lawofficer.com/Images/100...tcm22_1587.pdf
M4carbine.net has a very high density of pro's in their various fields . The main focus is work guns , gear and ammo , but hobby and legit defensive shooters are welcome.
ETA:
The usual disclaimer: 25 yard/meter zero is just a starting point. Confirm zeros at the longer ranges , if at all possible.
End ETA.
IMO , m4 is head and shoulders over the other " for pay '" AR site in terms of reliable , useful info with a minimum of useless fluff....
YMMV.