Rob63, It's very generous of you to help with Burnside carbine research. Could you check 30115 for me? - it appears to have had coastal or naval use - uniform salt water pitting.
Also, if you register as a user you can just use the "Start a Conversation" feature to send me a private message instead of starting a thread. It greatly increases the chances that I will notice it.
Regarding the number in question; sorry, but no hit, not even anything remotely close.