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From Pathfinder Treasure Vault (Remastered), which isn't enabled.

Wrecker

ITEM 0
Price 8 gp
Usage held in 2 hands
Bulk 2
Category advanced
Group sling
Damage 1d6 bludgeoning
Range 20 ft.
Reload 1

The wrecker combines a dwarven dorn-dergar with a heavy, gear-reinforced arm cover that allows it to be fired like an oversized sling, then retrieved and reloaded by manually activating a clockwork spool. A wrecker must be loaded to be switched from its ranged configuration to its melee configuration.

Pathfinder Treasure Vault (Remastered)ORC