Swivel in a Holland & Holland-type sidelock.


Swivel in a Purdey/Beesley sidelock.

Swivel - On a sidelock action, a connecting shackle fitted between the lower hook of the mainspring and the forward arm of the tumbler. This layout allows a faster lock time than with a Boxlock. The swivel causes the angle of the force applied to the hammer to change as the hammer falls, maintaining pressure and even increasing it as the mainspring's energy is released. 


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