Watch Youtube videos on disassembly. Clean every single thing on it. I break mine down to bare bones every 2 or 3 years and haven't ever had a FTE or FTF. Mine is 40yrs old and I shot it heavily 5-15 years ago. Not a lick of trouble ever and I would take it over any new gun on the market in a heartbeat.
Completely clean the gun. Take the barrel off and get a small drill bit and using your fingers spin the bit inside the gas ports. Replace the Rubber o ring and soak the stainless gas ring in cleaner and then slightly oil. When putting the stainless gas ring back on make sure the openings on the two rings are on different sides of the carrier.
Follow that to a T. I have heard that you can cheap out on the O-ring, but I wouldn't. Completely cleaning it means that afterwards, you can't take any parts off of other parts, not just wiping it down a couple of times
but I've heard it has something to do with the configuration of the metal rings that are under the barrel on the magazine tube that causes ejection problems
It could be something as simple as it wasn't put back together properly. That would cause it not to cycle correctly
This post was edited on 11/28 at 6:32 pm