Growth GunWeapon 9
Source Pathfinder Guns & Gears
Damage 1d6 Piercing
Type Simple
Range 30 feet
Price 700 gp
Weight 1 bulk
A growth gun is a +1 striking hand cannon made from the regenerative flesh of a hydra, troll, or other similar creature. It has an attached flesh sac that slowly replenishes one shot each round and can be loaded like a normal round of ammunition. It fires regenerating gobbets of flesh, bone, or teeth, determined by the damage type selected for its modular trait. A growth gun can be fired underwater, though it's still limited by the selected damage type as normal.
Activate 
Interact (magical, transmutation)
Frequency once per minute
Effect Make a ranged Strike. On a hit, the creature becomes covered in a mass of flesh that continues to grow on the target for a brief time. The creature becomes Slowed 1 for 1 round, after which the growth withers and falls off.
Craft Requirements The initial raw materials must include the flesh of a creature with regeneration.
Traits
Something of uncommon rarity requires special training or comes from a particular culture or part of the world. Some character choices give access to uncommon options, and the GM can choose to allow access for anyone. Less is known about uncommon creatures than common creatures. They typically can't be summoned. The DC of Recall Knowledge checks related to these creature is increased by 2.
MagicalSomething with the magical trait is imbued with magical energies not tied to a specific tradition of magic. A magical item radiates a magic aura infused with its dominant school of magic. Some items or effects are closely tied to a particular tradition of magic. In these cases, the item has the arcane, divine, occult, or primal trait instead of the magical trait. Any of these traits indicate that the item is magical.
ModularThe weapon has multiple configurations that you can switch between using an Interact action. Typically, switching between configurations of a modular weapon allows it to deal different types of damage (listed in the trait, such as “modular B, P, or S”), though it's possible for a modular weapon's description to list more complicated configurations.
TransmutationEffects and magic items with this trait are associated with the transmutation school of magic, typically changing something's form.