Im having trouble locating a company that makes IWB holsters for the SIG P220 combat. Usually my go to is vedder holsters, they only make one for the standard P220 with the SIG rail. The P220 combat comes with a PIC rail.
You could just use a heat gun and heat the rail part of a standard holster a little bit then shove the gun in and bam, you have a holster for a 220 combat. I’ve had to do that a few holsters after putting extended mag releases ect. On