Re: Mauser "Tube Gun" Sleeve
If you can afford a tube gun kit , buy a Remington SA! I've built many hunting rifles using Mauser '98 military actions. They are fine for that purpose and make some classic rifles. The tube gun is a competition platform.. I'm sure someone out there has a competition rifle built on a Mauser '98, that'll shoot right along side more modern actions. But, especially if "money is an object" (3rd. post), I don't think I'd be trying to fit a Mauser into an $850 tube besigned for something else! Your other option,,,, buy some aluminum tube/bar stock.
"Shoots real good!": definition; it didn't blow-up in my face.