Autos are realllll tricky. You HAVE to take them all the way apart when you clean them. Forend off, all o-rings, tubes, springs, etc, need to come off, be cleaned and put back on clean and dry. If you use a wet lubricant, it will make it stick. Same thing with the bolt. Now the main spring (in the stock) is something that I don't clean everytime, but pretty often, but every part in the gas system has to come off.