Hi Spike!,
What is the length & Twist of barrel...and what are you planing on "Doing" with your new AR15?
I have a few, and I "Do" different things with each. Knowing what you are going to use it for, and therefore, what type/brand of scope to recommend to you.
I'd also recomend a trip over to
www.ar15.com.
It is >THE< source on information for the AR rifles.
Tall Shadow