I've heard Kydex doesn't cause holster wear.. True or False?
I would say false, personally. Any holster will wear on a gun eventually. Most finish wear caused by leather holsters is caused by a poor fitting design. If a gun rides in a loose fitting holster, it is constantly rocking back and forth and will wear on the finish. Same could be true with kydex. Kydex holsters, by design, fit very snug to the pistol, so it should eliminate part of that problem. They will however cause more wear in the draw stroke due to the tight fit. Most metal finishes are much tougher than kydex and it will take quite a bit of use before wear becomes an issue, though. I have heard one thing I watch out for with kydex is that dirt and grit can become imbedded in the holster and that will cause accelerated wear on a guns finish. Good thing about kydex is that if you know it has gotten grubby, you can have at it with soap and water and an old toothbrush and clean it out much better than a leather holster.