They sometimes left non-rebounding locks on pigeon guns as well as rifles. A lot of the old timers thought that it gave surer ignition. Important in competition guns and rifles for dangerous game. I have a double rifle built in 1881 still with non-rebounding locks. Some were converted later to rebound and that's why you will sometimes find 1860's made guns with re-bounding locks just to confuse we gun collectors. Lagopus.....