I would suggest the Nikon P223 (2-pc.) or M223 (1-pc.) mount to get the height correct for an AR. I bought mine at Academy. Mine is the P series mount which was less expensive. If I remember right I paid about $50-60 for it.

It has been mentioned before, but you will NOT see the front sight through the scope even though it's "in the way." I've had this scope on an AR for about four years, and it works well for me.

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Or something like that . . .