flintlock, ignition system for firearms, developed in the early 16th century. It superseded the matchlock and wheel lock and was itself outmoded by the percussion lock in the first half of the 19th century. The best-developed form, the true flintlock, was invented in France in the early 17th century, probably by Marin le Bourgeoys. It had a frizzen (striker) and pan cover made in one piece. When the trigger was pulled, a spring action caused the frizzen to strike the flint, showering sparks onto the gunpowder in the priming pan; the ignited powder, in turn, fired the main charge in the bore, propelling the ball.