Ihave a offer to buy a 3566 pc center pistol .The barrel is the long 5 inch gun.

The gun is a 356 caliber.i know smith wesson made a 9mm barrel also.

I will buy the gun if i could get a 9mm barrel.
The gun is new unfired in pc case.
The guy has 2000 rounds of 356 ammo,but i dont reload so once that is gone,The ammo would be hard to find.

Can i ask or get any advice on where to get a 9mm barrel made,or find one of the original 9mm barrels for the 3566