I have a m2 that had issues cycling the shells and it was worse in cold weather. I sent back to Benelli and it came home with the same issue.
My boy friend has a m2 also and never had any issues. He has put over 10000 shells thru his gun so I took a shot in the dark and switched my bolt for his.
results: I have not had any issue with cycling , no matter what she’ll I use or how cold it is outside
i hope this helps