I acquired a Burnside Carbine, Serial Number 32325, a few years ago. I believe it is a late 5th model. I recently saw a post about an earlier Burnside where someone was able to identify the unit to which it was issued. Can anyone tell me what unit (if any) and when this particular Burnside 32325 may have been issued? It has what appears to be an inspectors mark on the stock above the trigger.