I have two very early .54s and the breech plugs and plungers are the same as the .50s. It is the newer ones that went to 11/16". I had one of those once too. I don't know why it wouldn't work in a Bighorn stock, the outside dimensions should be the same. A bighorn wasn't much more than an LK 93 or wolverine that came ready to use all 3 ignition types.
Last edited by flounder33; 02-02-2016 at 05:16 AM.