At the risk of belaboring this subject, I just want let everyone know that I replaced the slide release spring and have put 400 rounds through my PCR without incident. For those who are confused by this problem and its fix, the magazine spring and follower keep the upward tension on the slide stop. Thus, when the magazine is empty, the spring and follower force the slide stop up to lock the slide back. The slide stop spring mounts on the right of the receiver and maintains a slight amount of downward tension on the slide stop so it doesn't move upward when the slide cycles and hold the slide back prematurely. Believe me, this problem stems from the slide stop spring, not the recoil spring. It's an easy fix and all it took was the time to make a toll free call to Mike at CZ