Sniper Rifle

Advantages

 * Very high damage allows shooting while moving on lower difficulties.
 * Right-clicking with this gun in first-person will zoom. This is the only gun that can do that.
 * You can shoot parts of enemy guns through walls because of the high accuracy.
 * Highest accuracy in the game.
 * Highest damage in the game.
 * If you have mouse precision, this gun is probably the best in the game.

Disadvantages

 * Having a very slow fire rate, missing your shots will severely punish you.
 * Lowest ammo count in the game.
 * There is a recoil glitch on this gun that requires you to re-zoom the gun (even if you are not zoomed when you shoot) to get a stable shot.