Like Jeff, I rebarreled a Bubba'd grey rat 1899 take down in 22 HP into 219 Zipper. I did that a few years ago and am now waiting to dedicate the funds to fit a new stock. The gun is usable but a bit short for me at the moment. It looks like a previous owner took a belt sander to the stock to make it into a Cresent butt. The brass plate that was fitted to the butt isn't much to look at either.
The Zipper feeds great from the magazine with no alterations. The smith kept it as a takedown so I can switch between the barrels if I wish.
It was cheap so it had that going for it. My only regret was to use the traditional 1:14" twist rather than 1:8". The latter would have allowed me to use bullets up to 75 grs which would then have made it into a .224" High Power.
