My Norico SKS just quit firing the other day, the bolt will no longer clip into the butt end of the shells. Cleaned it over and over and re-tired and re-tired but cant seem to get it to fire. Its a hit and miss with the ejection sometimes it works awesome when you open the action but sometimes the round will just sit in the chamber when you tip the gun up it falls out. Im thinking the bolt assmebly is toast or something anybody have any ideas? Its a cheap gun so if its a serious job ill just replace it the gun has seem some serious abuse.