Scottish belt pistol J D DOUGALL Glasgow

[corrado26]

The boxlock is a firing mechanism in which the lock mechanism is mounted on the inside of the weapon rather than on the mostly right side. Boxlock closures were common in the 18th and 19th centuries. The breech owes its name to the fact that the lock mechanism is typically installed in a type of box, usually behind the barrel.
Boxlock systems have the advantage of being more compact than side-mount lock mechanisms, making them a popular choice for pocket pistols. Their compact design also makes them well suited for multi-barreled pistols and pepperbox pistols.

The lockwork is also enclosed in the box, which protects the lockwork from dirt and damage.

The disadvantage of a box lock is that it is more complex and expensive to manufacture.