I've got a gen4 G17 that I have setup for competition with a Glockworx trigger set and adjustable rear sights. I've been thinking about getting a 9mm barrel for my gen4 G22 for carry purposes, and also the ability to shoot lead bullets in 9mm. Also, I have Truglo night sights on the 40S&W.... In looking online at Glockmeister, I see that Storm Lake offers a "conversion" barrel for the G22 for 9mm, and I guess I don't understand why you just can't drop a 9mm barrel into a G22? Thanks for your help in understanding..... George Wanna kill these ads? We can help!