These are the standard Briley Side Kicks same ones still in production - they are universal. I've had a few sets good skeet distances, 20 will break trap targets. Browning, Perazzi, Kreighoff, Rizzini. Good for reducing recoil in a 12 gauge gun when training ladies or young shooters.
I'm sory to be a pian, but they make some just for Browning, and others for everything else. Thats why I asked what did you shoot them in?
Not marked? These tubes are a later version they have a little dove tail with a nylon button that little button can be filed to fit, if already too loose call Briley and replace, cheap and simple, the older tubes used to have a little round button held in with super glue this newer set is a much better design. Joe