[Montefeltro 20 ga.]

I'd tend to stay away from the spray lubes... just a little goes a long way and spraying the lube puts it places it's not needed and will only attract dirt/grime.

 

I use Tetra Gun on most of mine and have been quite happy with it... be sure to shake any of the synthetics well before applying.

[Questions about the M3 Semi/Pump version.]

I've got an M3 and am very fond of it...

 

I am a die hard Benelli fan, so it makes a good defense gun since I use Benelli's for hunting - all function is the same and control location is identical (with the obvious exception being the pump option)...