I know they can be interchangeable, but can't remember if it's 38 to 9, or vice versa. About to send my 9mm Kimber in for some work and was wondering if I could have a Kart NM 38 Super barrel fitted for it. Been wanting a 38 Super for awhile, and figured this would be cheaper than a whole new gun. Whole new guns are great, but sometimes reality kicks in. You noticed that I used the word sometimes.