Rebel Matchlock (3.5e Equipment)
From D&D Wiki
When the coastal cities and provinces rebelled against their empress, they required a means of allowing their trained militia and hired mercenaries to stand toe-to-toe against the imperial army's powerful wizards. To this end, they consulted with the other races they had friendly contact with, and developed a weapon that would become known as the Matchlock. By means of complex alchemy, this weapon propels a small, round sphere of lead at high velocity, impacting with deadly force against even the sturdiest combatant, tearing a hole in anything short of steel plate. While this weapon is common among the front-line soldiers of the rebellion, a lack of sufficient production methods makes it very rare indeed in both the empire, and among mercenaries and troubleshooters.
This weapon is not meant to be purchased, though a cost has been given for those DMs who would for some reason want to include it as such. It is intended to be a special and rare reward, with a limited ammunition supply, for those parties who have progressed far enough into a campaign that the weapon is useful, but not game-breaking. It requires a full-round action to reload. Each round of ammunition, with included wadding and gunpowder, costs 1 gp for a civilian, or 1 sp for a soldier.