A flintlock gun is a type of gun that was used in former times. It is fired by pressing a trigger which causes a spark struck from a flint to light gunpowder.
flintlock in British English
(ˈflɪntˌlɒk)
noun
1.
an obsolete gunlock in which the charge is ignited by a spark produced by a flint in the hammer
2.
a firearm having such a lock
flintlock in American English
(ˈflɪntˌlɑk)
noun
1.
a gunlock in which a flint in the hammer strikes a metal plate to produce a spark that ignites the powder