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.[full citation needed]
- Henrotin, Gerard (2009). The Boxlock Pistols Explained. Belgium: H&L Publishing.