Complete the indicated task to unlock the corresponding special weapon, which have unlimited ammunition and do not degrade.

Weapon	How to unlock
.357 Magnum	Complete Sidequest #11, "Snack For Willie", with all seven bones in your inventory. Then, find Forrest and Willie. Willie will take the bones. Find Forrest's truck and take the bones back.
10mm submachine gun	Complete Sidequest #14, "Map To Psychic Spot A".
12Ga shotgun CQB	Complete Sidequest #15, "Map To Psychic Spot B".
Axe	Re-enter the Sheriff Department Other World.
Chainsaw	Re-enter the Harry's Mansion Other World.
Grass Cutter	Re-enter the Community Center Other World.
Light Sword	Complete Sidequest #39, "Top Collector".
RPG	Complete Sidequest #16, "Map To Psychic Spot C".
Wesley Special	Complete Sidequest #50, "Ghost House Treasure".
Wrench	Complete Sidequest #29, "Engagement Ring".