Pistol - 10 bullets
Sniper - 2 bullets
Bazooka - 1 shot but is controlled
Uzi - 10-25 bullets
Shotgun - 20 bullets/5 shots
Assault Rifle - 13 bullets
Magnum - 4 bullets
Flamethrower - 10-60 shots
Bazooka - One shot kill, Explosive, but can be controlled so it's useless against hard AI. Only works in certain places such as doorways.
Sniper - Takes two shots to kill, can destroy multiple obstacles, but has the longest reload.
Magnum - Takes four shots to kill, can break through a single obstacle, only six bullets.
Shotgun - Takes five shots to kill, great knock-back.
Pistol - Takes ten shots to kill, has a slight chance of knockback.
Assault Rifle - Takes thirteen shots to kill, some knock-back, an Uzi but fires in a straight line.
Uzi - Takes fifteen to twenty-five shots to kill, rapid fire, bullet trajectory is random.
Flamethrower - Takes 10-60 shots to kill, can kill multiple people, destroy all obstacles except metal barrel, but it's a double edged sword
Therefore the best weapon in Superfighters is the Flamethrower if you're careful with it.