OK. Just got back from the range after shooting my all stainless Ed Brown commander and had 4 or 5 failures to feed the last round. This pistol has a few thousand rounds on it and I’ve seen this same failure recently. Now it’s happening more often. I’m cycling through 3 range magazines. The last round is starting into the chamber and the rim is just beginning to slide up under the extractor. A hard rap on the back of the slide and the round chambers. Worn out magazine spring? Worn out recoil spring? What do you think?