Here is a range report on the different springs sold by wolf for the p3at. You guys know, the gun that nobody should buy and Keltec KNOWS there is a problem but refuses to fix it and just keeps selling defective guns ;D 100 rounds PMC range ammo 13# spring, 100% fire recoil about the same as stock. 15 rounds Hornady Critical Defense 100% recoil still harsh. After cleaning rails 15# spring 100 rounds PMC, 100%, recoil much softer and nice to shoot. 15 rounds Hornady CD 100% recoil softer but stronger than range. Still it felt much nicer to the gun. Again clean rails and run few patches through barrel. 16# spring 100 rounds PMC. 11 FTE. Recoil very soft, felt spongy. Hornady CD 15 rounds 100% cycle. Recoil felt much like range ammo at 15#. Since I had problems with ejection I dropped back to 15# and cleaned rails again. fired 100 more PMC rounds and again had 100% cycle. I'm sticking with the 15# springs. The difference between 15# and stock is like night and day. So out of 100 rounds I had 11 FTE with a 16# spring that does not come stock. Using the 13 and 15 pound springs I fired 345 rounds with ZERO problems.