Barrett B. also wants a Barrett M82, specifically in the newer short barrel design, the Barrett M82A1-CQ. If I have looked this up correctly, the military designation for this is the Barrett M107.
I looked at a lot of videos, but the one I picked is Jerry Miculek's review of the rifle. He takes the rifle apart, talks about the features, and then takes the rifle out and shoots it. He doesn't go out to what I would call a long range, but he does what he does best, he shoots fast and he has a lot of fun.
If this is your grail gun and you get to shoot one, I hope you have as much fun as Jerry.