I changed the recoil spring for shooting wimpy bullseye loads. As the come from the factory, they are set for ball ammo and if you shoot light loads it will not always function reliably. If I were feeding it a steady diet of +P ammo, I might put a heavier spring in to save battering on the frame. Wolff makes them in all weights. I broke my gun in on hardball and after 800 rounds went to 185 grain lead SWC and light charges for target shooting. Ejection was a problem and a lighter spring cured it.