I bought a 151K last week with a problem. I will load & shoot the first round. It then ejects the empty case & loads a new round. The problem is, When loading the next round, it doesn't push the bolt back far enough to cock it. You have to manually pull the bolt back ejecting a good round onto the ground so it will fire again. I took it apart & scrubbed it several times yesterday. I did notice the breach plug & Retracting Spring Bushing are very worn. The Retracting Spring Bushing is missing the large flat washer looking part. The main spring may also be out of shape a bit. Could this wear keep the gun from functioning properly? If it matters, it also has a cracked stock. Any help would be great. I want to get the kids out shooting now that it's warming up.