I was cleaning my Ruger and had a problem removing the bolt cam pin in the bolt carrier assembly. It actually looks like it has a crack in the middle 3/4 way around the pin. I had to work hard to remove it. I assume that's not the way it came from the factory. Can someone tell me what should I replace because of this? I was also wondering if there are other better components, I could replace the bolt carrier assembly with? Anybody have suggestions? The AR-15 is new to me. Thanks for any help!