Spring Sheath (3.5e Equipment)
From D&D Wiki
Cost: 8 gp (cost of dagger not included) Description: This device is attached to the forearm via two leather staps. With a flick of the wrist it's spring loaded action pops a dagger (or similar object) into the hand of the user. A search DC of 12 is required to discover the device with a pat down. Without semi regular maintenance the dagger 'may' accidentally release (DM's option).
Benefit: This device grants the user free use of the quick draw feat with the sheathed item.