So I've been looking into the Benelli M line of semi automatic shotguns. What I've found is that the Benelli M2 and the Benelli M4 seem to be the most common with the Benelli M1 and the Benelli M3 being uncommon. I can see why the Benelli M1 might not be so common anymore since we've got the more advanced M models but what I don't get is why the Benelli M3 is so uncommon. From what I know the Benelli M3 can be switched between pump and auto while the M2 and M4 are strictly auto loaders without the option of going pump. The reason why you might sometimes want to switch to pump is because with less powerful shells the recoil might be inadequate to chamber the next round. That being the case I don't see why the M3 isn't more common.