Californians are always going to be limited to GEN 3's. Some will get new GEN's via private sales (at a price premium). Realistically, I'm not motivated to think the marksman barrel will make much of a difference in my performance to convert my pistol GEN's. But the option would be nice, and even if I was living in a free state I wouldn't seek out a GEN5 until I could get one with a certificate. But that said, given my experience with having barrel modifications done to my bulls eye competition guns I can tell there is a difference. I had a .22 that gave me problems and occasionally would throw what I thought was otherwise a perfect trigger break. I got the barrel crowned and I never had that problem again. ******** Realistically I don't think anyone would notice if I crowed an OEM barrel. I'd have to have it refinished to blend in (the crowned product would have a perfect silver ring at the end). I just think it would be nice if rules allowed modifications of older GEN's to put them on par with newer GEN's. Like being able to swap out for Glock made (-) connectors. Like I mention in another thread, I would simply buy an OEM Marksman Barrel for a Gen3/4 if it was made.