This weapon addon, From Xeo adds in a prototype Sniper Rifle code-named Cheyenne. This weapon like the Super Sniper can break door locks and kill anyone with a shot to anywhere on the body. This addon isn't by me nor do I take credit for it's creation, This file was on the Swat 3 reunited website. I reuploaded it here to get interest in Swat 3 again.
Put the Cheyenne Pro file in Sierra/Swat3/Mods file, Enable via the swat 3 mod launcher and enjoy the weapon in it's full force.