
Sidelocks are significant in several cultures: ...
Found on
http://en.wikipedia.org/wiki/Sidelock

A type of action on a break-open gun where the lockwork (hammer, sear, mainspring etc.) is mounted to the back side (inside) of a plate (or pair of plates for a double gun). A sidelock is superior to a boxlock because: 1. Less steel needs be removed from the bar of the action; the action is therefore stronger. 2. The lock plates provide a larger ca...
Found on
http://www.hallowellco.com/abbrevia.htm
No exact match found.