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I have been looking at buying a 20 gauge semi. I looked at the M2 American and the Montefeltro. Does anyone know if the M2 American model comes with adjustment shims? Is one better quality than the other? Thanks in advance.

I own both of them. Great guns but diffrent.
My Monte came with shims (heard the new ones don't ?), the American, no (it has the B installed)
Monte has longer forearm and holds 1 more round
M2 has higher rib on barrel
M2 is easier to clean the magazine tube.
Use the Monte in open fields where I'm not in heavy brush. Its too nice to scratch up
Can't go wrong with either