Sorry you didn't know - John Ciener is generally regarded as a pretentious jerk and the kits are far from reliable. That said, if its a reliability problem you have they can be made to run very well, but you'll have to take matters into your own hands. Polish everything on the kit. Every moving part. Do so until its smooth as a baby's bottom. If its for an AR15 I would also recommend trying to get a dedicated .22 barrel by Rick Kuehl which eliminates the need for the problematic chamber adapter that comes on the ciener kit.