Revolver (3.5e Equipment)
From D&D Wiki
The Revolver is a relatively new (And expensive) version of the matchlock and flintlock pistols and rifles some kingdoms are known to employ. Revolvers carry up to six bullets, but take longer to reload (A full-round action of reloading compared to a move-reload). Due to the nature of the weapon, it is rare to find one in most any place. The weapon appears as a hand-cannon fashioned with a small cylinder filled with six bullets that function on a powder mechanism, though some magical variants are already on the rise. A Revolver uses "Sling" bullets as ammunition.
Note This weapon can be crafted, at a Craft (Engineering) DC of 25.