Yep, I meant to say slide and barrel. I know that Beretta made a "combat set" a few years ago that was a Beretta frame with both 9mm and .40sw slides and barrels all in a nice little case. I was thinking of seeing if I could not find a 9mm slide and barrel and just swap them between the two? Any ideas of where you can find a slide? I don't want the conversion barrell.
It would be cheaper to just buy another P99. I checked into this a couple of years ago. The cost of a new barrel and slide was the same as a brand new gun. With the new gun, you'd get the magazines too.
If you just get a barrel, you'll need to make sure it's the same length as the .40's barrel and as thick. The barrel and slide of the .40 is longer than the 9mm.