Convert firestar 9mm barrel to .357 sig?

[rintinglen]

I have a Star Firestar that I bought originally in 40 S&W, but found a 9 mm slide assembly which works perfectly, making for a neat dual caliber package. What I was pondering was whether I could re-chamber a 9 mm barrel and fit it to the 40 slide to give me a "Three-fer." I have had a hankering for a .357 Sig for some time now, but can't see my way clear to buying another gun now.
If this would be do-able on the cheap (barrel plus reamer) it would make a neat project. What say ye?

[skeettx]

Yes, and use the 40 S&W Magazine

You have the old Firestar, yes ?

https://www.gunpartscorp.com/gun-manufacturer/star/firestar-old-model?page=3

[rintinglen]

I was not aware of the fact that there is a "new" Firestar." How do you tell them apart? I'm pretty sure mine is the "Old" made-in-Spain, in the 90's model, but I've learned never to be sure when it comes to cars or firearms.

[skeettx]

http://www.star-firearms.com/firearms/guns/firestar/

and

https://forums.gunboards.com/showthread.php?380-How-do-i-tell-if-my-Star-Firestar-is-New-Or-Old-Model