I purchased the Legion version of the OWB Leatherwing holster by Blackpoint Tactical from the Sig Store.
Then I had my P229 Legion milled for the Leupold Deltapoint Pro with the Sig Armorer Robert Burke.
So when I got my Legion back, I could not use the holster anymore because of the mounted optic.
I reached out to Blackpoint Tactical if they can help me and they agreed to remedy it for me. I sent them the holster and they fixed it to allow the pistol with the red dot. They did this for free, all I had was to send the holster back to them. They even did not charge me for return shipping.
Kudos for the exceptional customer service!