John can correct me but I'm thinking a 50 BMG 
Correct Goose, mine was an ArmaLite, but some of the other guys preferred the Barrett, obviously both will get the job done. By the way, mine fully decked out, weighted in at a bit over thirty pounds. As you can see it is not a weapon you would want to use if you had to move out in a hurry and say run 100 yards with a pack and rifle to your extraction point.
I don't believe any of them you showed are near the equivalent of the ar 15 that you will see in the common hunting scene .
Both of the ones I posted are available on the civilian market with the same mil specs. Are the common, probably not I only know of two out here in our area that have them, both in .308.
IMO and experience it doesn't matter what an idiot hunts with be it pump, bolt, semi-auto
or full auto they are still idiots and will continue to tarnish good and ethical hunters reps.
Chris, hard to argue with that statement. Dumb is as dumb does.