Well let's see. One time the shells wouldnt extract. Ok changed extractor, the next time the trigger was freezing up, dont know what cause that or how it got fixed, one time the bolt wasnt coming back all the way to chamber the next round. One time the follower was getting stuck in the magazine tube. One time in the middle of the match the shell drop stopped working, like what drops the shells into the breach so you can chamber them..... at a certain point I just stuck it in my closet and starting using my 20 year old pump action.