I NEED AN ANSWER

[williamlayton]

I have a Sig 239 with both the .357sig and .40 barrels.
What would it take to change the 239 to a 9MM ?
Blessings

[mcwoodduck]

Go to the Sig Website.  See if they have a caliber conversion kit for it.  In the Sig Store. 
I know they have caliber conversion kits for about $350 for the P226 and P229 to swap the whole upper from 40 /357 to 9mm. 
If they do not have the conversion kits a call to them may get you the answer you want as they will probably sell you the slide, barrel and spring and Mags.  It may cost more if you ask them for Nite sights

[jhm]

     William I have bot cal in the 239 9mm and .40 I will see if the 9 mm will fit and function on the .40 frame.   Jim

[jhm]

     William the 9mm will fit on the 40 frame but the mag is loose and removing the slide was vary difficult, the .40 fit the 9mm frame but the mag. wont go into the frame as it is wider, the bolt faces I believe will be of different width as the 9mm and .40 are of different widths, best advise would contact Sig, or do as I do and just buy another handgun, we are always needing a reason to shop dont we?  As Always  Jim

[Empty Quiver]

EFK Fire Dragon conversion barrel is what you are looking for.  Out of stock right now it looks like and will run $150. Looks like you'll need 9mm mags to complete the package, do yourself a favor and get SIG or Mecgar mags accept no substitutes.