HJL,
Regarding Two Letters Re: Gock 27 .40 S&W Pistol, dropping a 9mm conversion barrel into a 40 caliber Glock pistol does NOT make it the same as a factory 9mm Glock. The extractors and ejectors are not the same (anyone can verify this by looking at the Glock parts list), and that makes it a FrankenGlock. This is fine, if you just want to save money shooting 9mm for practice out of your 40. However, if you’re going to stake your life on the gun, please be aware of the differences and make the decision that’s right for you. Glocks are wonderful (and I’m definitely a Glockaholic), but they are not infallible, and I would never want to trust one that is not configured according to factory spec or better. Best Wishes – Ulysses