My father has one and I remember that years ago he had an issue with the trigger not getting reset but it seems like the cartridges would eject most of the time. He told guy at gun store about it and the guy sold him a spring for $3. Told him how to get to it and to measure his versus the new one and if old spring was compressed 3/4”, that would fix his problem. He tore into it and sure enough it was exactly 3/4” shorter. After that hasn’t had any issues with it that I know of.