So if that is a brand new M4, did it come from the factory with that fore-grip and the round oversized bolt-release button? If the gun did not come that way from Benelli, someone installed the items after the fact. If it’s brand new, the model # & serial # will be printed on the identifier-label on the Benelli box, and the serial # number is also engraved on the gun/receiver..you can go online and submit the serial # to Benelli and inquire if it included that foregrip & oversized bolt release button.