Boxlock action

The boxlock action is a hammerless action of a type commonly used in double-barreled shotguns, dating back to 1875. It was developed by Anson and Deeley, based on the earlier Westley Richards action. The boxlock action uses concealed, self-cocking hammers in a break-open action. Strongly opposed at first by most sportsmen and manufacturers, the boxlock action quickly became the dominant form of double-barreled shotgun action.[1][2][full citation needed]

The side by side boxlock action, shown with the action open, hammers cocked, and hammer block safety on


  1. ^ "Action, Boxlock". SAAMI. Archived from the original on 2008-04-09. CS1 maint: discouraged parameter (link)
  2. ^ Daniel Coit Gilman; Harry Thurston Peck; Frank Moore Colby (1904). The New International Encyclopædia. Dodd, Mead and Company. p. 808.
  • Henrotin, Gerard (2009). The Boxlock Pistols Explained. Belgium: H&L Publishing.