HI Casey
I was able to acquire a genuine .30 body minus the barrel.
Photo one. It had been buried for many years and once I had it sandblasted you could make out the serial numbers.
Photo two. I had my lawyer take it up with our state police firearms branch and they gave me an answer in writing that as there were no moving parts or genuine barrel I could display it on my Jeep at any time without a permit.
Photo three. I later contacted the Firearms branch regarding converting it to gas firing and I was advised as it could not actually fire a projectile I did not need to register it or need a permit.
Photo four. This makes things much easier when involved in any re enactment shows.
Cheers
Tony