On the origin of the term lock: "The fabrication of these devices fell to locksmiths ... They gave to the firing mechanism the enduring name lock". (War on Land, Robert Curley (ed.), Britanica Educational Publishing, 2011)
Britanica.com, Matchlock, accessed 29 October 2021.
capandball.com
The 1807/35 M “Console” Jägerstützen, a tube lock, was one of the most basic of conversions. It replaced the flint in the cock with a piece of steel to become the hammer (The story of the Augustin tube lock ignition system [accessed 31 October 2021])
The Queen Anne pistol is a notable exception. It is a breech-loading flintlock in which the barrel is screwed off to load the chamber. In this style of firearm, the chamber and lock-plate are forged as a single piece. However, the lock-plate is still off-set to one side. (See: Silver Clad Queen Anne Pistols)