Use the following weapon names with the /give weapon_ code:

WEAPON - CODE
.357 Magnum - 357
9mm Assault Rifle - 9mmar
9mm Handgun - 9mmhandgun
Crossbow - crossbow
Crowbar - crowbar
Desert Eagle - eagle
Displacer - displacer
Egon Gun - egon
Gauss Gun - gauss
Grapple - grapple
Hand Granate - handgrenade
Hornet Gun - hornetgun
Knife - knife
Laser Tripmine - tripmine
M249 SAW - m249
M40A Sniper Rifle - sniperrifle
Penguin Bomb - penguin
Pipewrench - pipewrench
Rocket Thrower - rpg
Satchel Charge - satchel
Shock Rifle - shockrifle
Shotgun - shotgun
Snark - snark
Spore Launcher - sporelaunche