My postings on this forum attest to my support of Springfield Armory, including their customer service, which is very good. If I'm ever not carrying a XD Mod2, it's only because I'm carrying a XDs instead. Having said that, here's what happened on my recent trip to the Glock factory. On August 8, 2018, I made the 120-mile voyage to the Glock factory in Smyrna, GA. The security was impressive, armored, and very polite. The guard put a coil lock on my Glock and asked me to leave all other weapons in my car when I entered the building. CC was strictly prohibited. The staff was extremely professional and polite. After ringing an intercom doorbell, I was buzzed into a waiting area that was approximately 25 x 25 feet. There were chairs all around the walls and a giant TV playing Glock commercials and infomercials. Unfortunately, this was the only room to which I was given access. Seconds after I was buzzed into that room, an armorer entered, introduced himself, and asked what he could do for me. I told him my Glock 22 is 21 years old, is showing significant wear, that I wanted it checked for safety and would like a new recoil spring and anything else the armorer felt was necessary. The armorer examined it quickly, then said it looked like I had used it a lot and taken good care of it. Then he smiled and said, “Give me an hour or so. You can wait here or leave and come back.” Hungry, I decided to seek food. The security guard gave me directions to a good BBQ place nearby. An hour or so later, I returned from the restaurant, went through security again, and returned to the nice little waiting room. I waited less than 5 minutes before the armorer entered the room, handed me my cable-locked Glock, and explained the work he had done. He also gave me a printed invoice. I was charged absolutely nothing, and the following things were replaced on my 21-year-old Glock: 1. Connector 2. Extractor 3. Spring Loaded Bearing 4. Extractor depressor plunger 5. Extractor depressor plunger spring 6. Firing pin 7. Spacer sleeve 8. Firing Pin spring 9. Firing Pin spring cup 10. Firing Pin Channel liner 11. Firing Pin safety 12. Firing Pin safety spring 13. Locking Block 14. Locking Block pin 15. Recoil Spring 16. Sight Rear 17. Sight Front 18. Slide Lock 19. Slide Lock Spring 20. Slide Stop Lever 21. Trigger housing with Ejector 22. Trigger Spring 23. Trigger with Trigger Bar 24. New mag All for FREE! I am enormously impressed! If more businesses did business like Glock, this world would be a much better place! After my experience at the Glock factory today, my already high respect for Glock has increased exponentially. In response to questions I asked, the Glock armorer confirmed that the SF frame (which I think became an option with Gen 3) is the base frame for Gen 4 and 5. The armorer also said that he does not know all of the corporate plans, but as far as he knows, 9 mm is the only caliber that will be offered as Gen 5 in the near future. Those of us who prefer 40 and 45 should not hold our breath for those to be offered as Gen 5.