Weapons

Overview
There are many weapons in the game that are used to kill zombies. They can be split up into multiple categories:

Melee
Close quarters weapons. You must directly hit the zombie with your weapon.

Shotgun
Your close range weapons. Heavy damage with good aim but helpful with groups of zombies. Can one shot a Phantom zombie if super close and aiming at head

Automatic
Close to mid-range weapons. Good for most things. You'll probably use these the most.

Sniper
Long range single shot weapons. Some have scopes (some have and others don't). They have low ammo and slow rate of fire but higher damage over all and better accuracy.

Explosives
All things Boom. The grenades are pretty useless unless at your base. The rocket has a long reload but is more useful. Combustion does less blast dmg than the frag but also causes burning. Hurts the thrower if too close

Incendiary
Sets zombies on fire

Sentries
Auto fires on zombies in range.

Trivia

 * The M61 Vulcan is actually an air soft gun based on the M134 A-2 rotary gun better known as the Mini gun.
 * Sten gun is a group exclusive weapon.
 * Snipers scope will work even in third person. (Note: if you use this in third person when you disable the scope you will be in first person)
 * The Sten gun is better than the Assault Rifle and the SMG.