Charleville muskets were shipped from France to America in three parts: lock, stock and barrel – giving origin to the phrase "lock, stock, and barrel."[citation needed] Flintlock of an 18th Century hunting rifle, with piece of flint missing. ... Folding stock of a SIG 550 rifle A stock or buttstock or shoulder stock is present in many firearms and some crossbows, and performs three functions - to facilitate easy and steady holding and aiming of the weapon prior to and during firing (which may be further assisted by a sling... This article does not cite its references or sources. ...
Almost all muskets in this period were fired by the matchlock mechanism, where a length of smouldering rope ignited the gunpowder in the weapon's pan, causing the ball to be fired out of the barrel.
When muskets were fired by the flintlocks mechanism, they either filled the pan from a powder flask after loading the ball, or from the paper cartridge before pouring the bulk of the gunpowder down the barrel.
Use of musket infantry tactics was manipulated to the fullest by King Frederick William I of Prussia in the early 18th century.