I spoke with Marc Lipp today, they are currently reviewing the list of replacement sights authorized for the Production Semi-Auto's for PPC. If you are thinking about changing your sights, they need to be on the authorized list. I presented a sight for consideration, they checked it out and said it was good to go. They are seeking input, so if you have a sight in mind get a hold of them and get your sight considered. The whole process took less than a couple of hours.