I bought a Glock 17, I liked it so much, that I bought a model 22 so I could have a .40 on the same frame and feel. They are both Gen 3. I adjusted the sights to the side on the 17, and it shoots right on for me now. Now the model 22 was shooting to one side the first two times I shot it (60 rounds). So I moved the sights over to compensate. Seemed over the next 70 rounds, the sights needed to slowly be moved back to where it originally was. Well that seems strange. Does the barrel kinda shift or get seated in against something after the first 100 rounfd?? I've heard people talk about breaking a barrel in on rifles, but never knew or understood what really happens?? Any If you guys tell me I'm crazy, or this is highly unlikely, thats OK, I may buy that. But please don't tell me it's my trigger finger. I paid very close attention to my finger. OK, that isn't a problem anyway right now. It's only got me curious. Now, the model 22 is shotting about 5 inches high for me at about 60 ft from target. My 17 shoots right on hieght-wise. I'm not any weaker in the wrist than anyone else. I know the .40 cal has more recoil than the 9mm. But 5" high at 60ft?? Whats your guys thoughts?? Is there any way to adjust sight height??