1) Flint 2) The flint in a flintlock 
• (n.) A sharpened flint for the lock of a gun, to ignite the charge. It was in common use before the introduction of percussion caps.
Gun'flint` noun A sharpened flint for the lock of a gun, to ignite the charge. It was in common use before the introduction of percussion caps. 
[n] - the piece of flint that provides the igniting spark in a flintlock weapon
noun the piece of flint that provides the igniting spark in a flintlock weapon
the flint in a flintlock.