Benelli Supernova - problems, jams and sadness (solved now)

UPDATE: After meeting with hammer, vise and Dremel my Supernova reconsidered feeding problems. There was last attempt to resist in form of double feeding from magazine, but it was swiftly and brutally dealt with. Last match was flawless - culprit was side of shell carrier bent outwards from factory. Other Supernova with same problems was also cured same way. I’m not good shotgun shooter, but this is far beyond being bad shot: My Benelli Supernova gives me all sorts of problems since I got it. Light