Here's a young male I got yesterday at 140yds with my Stoney Point Polecat Rapid Pivot Bipod that my wife got me for Christmas (with a little help).
(http://i9.photobucket.com/albums/a93/GAJoe/29lbMale001.jpg)
It's a great bi-pod. It has all the pluses of a bi-pod and shooting sticks. The yolk is flexible ( allows you to cant and lean forward/backward) and it snaps on and off easily. It has an adapter that connects to your existing swivel and provides another swivel attachment. Sorry you can't see the yolk on my photo. Here's a link to see it:
http://www.stoneypoint.com/rapidpivotbipod_photos.html
They have three sizes. This size is $40 at Midway.
This won't work on a AR will it?
I would say it depends how you have your AR set up. If you have a traditional sling swivel it should.