From Pathfinder Lost Omens Firebrands, which isn't enabled.

Wrist Launcher

ITEM 0

UNCOMMON AGILE CONCEALABLE FREE-HAND

Price 3 gp

Usage held in 1 hand

Bulk 1

Category martial

Group dart

Damage 1d4 piercing

Range 30 ft.

Reload 1

This slender tube is attached to a large strap worn on the forearm. You can fire a dart from the tube with a twist of the wrist. The wrist launcher uses Darts as ammunition.

Pathfinder Lost Omens FirebrandsOGL