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The frizzen is a crucial component of the flintlock ignition system, a mechanism used in firearms developed in the early 16th century. This system superseded earlier designs like the matchlock and wheel lock, and was eventually replaced by the percussion lock in the 19th century.

The frizzen is a pivoted metal piece that works in conjunction with the flint. When the trigger is pulled, the flint strikes the frizzen, creating sparks. These sparks ignite the gunpowder in the priming pan, which in turn fires the main charge in the firearm's barrel, propelling the projectile. The best-developed form of the flintlock, invented in France, featured a frizzen and pan cover made as a single unit.123

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