Tactical holster - 5.11 Tactical ThumbDrive Holster

This holster works fine for a Glock model 35, but there can be a problem. The problem is with a MOS gen 4 pistol with Leupold Delta Pro optic, and co-witness sights. The co-witness front sight is too high, and will not allow the pistol to be placed into the holster, and if you do get it in, you can't get it out. I modified my holster by removing the top of the holster that the front co-witness sight was hitting,(Dremel tool) and gluing a piece of brass across the bottom (Gorilla Glue Epoxy). This supports the sides of the holster, so it does not spread sideways, and retains the pistol. Granted, this was not an authorized modification, but it was the only way I could make it work with my problem. The holster works fine now. The co-witness sight is from Dawson Precision (310-197)