I've known where the barrel was since 1984. Jerry (Jake) Simmons of Goshen, Indiana had it.
I tried everything I could to get it from him, even sent him a copy of the GD article. His only use for it was to bug me about it. Just a few days before he died he sent me a note and ask if I knew he had a Maynard smooth bore barrel made by Niedner.
When they auction off his stuff a few months ago the barrel was not in the catalog and I was worried. I called around and found the guy who had bought all the stuff not in the auction. He did not have the barrel but remembered it in a case with other stuff that the auction people removed.
I called the auction house and seems they had forgotten to list it so they put it in the next auction.
The wait was twenty-seven years, not bad considering it took twenty-one years to get Niedner's Ballard-Schuetzen. Same deal except the owner lived here in Anchorage and every time I saw him he would ask if I knew he had Niedner's Ballard.