It seems I'm wrong. I asked about the .357 Sig conversion barrel for the PM40. Here is Kahr's response:
***************************************
Ralph,
We've looked into a .357 barrel. Unfortunately it doesnt work as easily as you'd think because of the offest feed ramp and becuase the higher pressure round, creates a lot of wear. Our pistols are a lot smaller and lighter than say a glock or sig that has the interchangable barrel so it takes a lot more of a beating. I don't think you're going to see an interchangable barrel, especially for a PM series. An aside, did you have Cylinder and Slide do your porting for you, or someone else?
Clayton Covel
E-Commerce Manager
508-635-1428
*******************************************
Oh well, learn something every day!
Ralph