In my Bonehill Catalogue 1888, there are 5 fore-end fasteners listed that can be had on his shotguns, Deeley & Edge, Anson, The Bonehill Patent, the Key and the Grip Fore-end, I'm sure there are other variants. I have a Bonehill Patent, its basically a minature Jones underlever, the lever snaps down into the latch and must be first lifted and then turned. The one CJO is asking about is called the "Grip Fore-End" fastener. FWIW --- John Can,