Box versus Side Lock

In a boxlock gun, the mechainism is housed inside the receiver. In a sidelock, the sear/hammer/mainspring assemblies are mounted on detachable lockplates.
 
To add a bit, Westley Richards also has this patent - what is known as the Droplock.....a variant of a Boxlock that enables the removal of the locks via a hinged bottom plate on the receiver.
 
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