Differences between M1 and M2 Benelli??

[nssa4914]

Can you all tell me the differences between the M1 and M2?

[.351winchester]

Dunno the M2. M1 is auto, M3 is a pump/auto convertable like a practical sized SPAS 12
Main advantage being auto firepower but the ability to manually cycle via slide/pump action, loads that would be too light for the auto