Wheellock

A wheellock, wheel-lock, or wheel lock is a friction-wheel mechanism which creates a spark that causes a firearm to fire. It was the next major development in firearms technology after the matchlock and the first self-igniting firearm. Its name is from its rotating steel wheel to provide ignition. Developed in Europe around 1500, it was used alongside the matchlock (c. 1410s), the snaplock (c. 1540s), the snaphance (c. 1560s), and the flintlock (c. 1610s).