I have a G23 Gen 4 and use a conversion barrel for 9mm which is my primary caliber. I still use my 40 barrel but 90% of my shooting is with the 9mm to shoot more and spend less. I have three questions. 1. Generally how long (number of rounds) does the RSA last? Also how to inspect for wear? 2. What is the RSA spring lbs rating of the G19 Gen 4 RSA vs the rating of the G23 Gen 4 RSA? 3. In a upgraded RSA, does that steel shaft in the RSA increase stress to the frame or transfer more recoil to the shooter? Thank You.