What is this for snipergun? More info somebody?
The second picture is the Barret M82A2 (bullpup version of the M82) which is used by US forces. You can see the placard in the top-right of the photo. It's even actually in the file-name itself (socom%20gear%20barret%20m82a2).
The top picture is an Iranian rifle though. AFAIK there's no official designation but it's an anti-material rifle judging by the size of the magazine. Like the M82 it's also a bull-pup (magazine behind the trigger unit) and over-the-shoulder design. The configuration and sheer size of it makes it extremely difficult to describe it as a "sniper rifle" IMO.
Another one of our members was able to ID the scope that's mounted to the side of the rifle - this fact alone should give a good idea of the scale of the rifle - it's so large that the shooters head doesn't even come above the top of the rifle.
http://www.barrett.net/optics/bors