Here's what you have to look out for. I've heard competitors have gotten the heat gun out to make sure no daylight shows.
Rita
F. Can have no offset backpieces and/or belt slots. The holster may not offset away from the belt and/or body. No gap is permitted in the following areas:
1. From the body to the inside of the belt.
2. From the outside of the belt to the inside of the backpiece and/or backside of the holster.
3. From the outside of the backpiece to the inside of the holster.
If you look through the belt slot area of the holster with it on the belt/body, you should not be able to see any daylight. If you can see through this belt tunnel area, the holster is not approved.
Holster/backpiece must be constructed of “normal thickness” common holster making materials, no filler is allowed to hide an offset. In simple terms, the back of the holster must be held tightly.