The GG&G one piece benelli M2 receiver scope mount provides an easy way to mount a tactical scope to the factory drilled and tapped receiver of your Benelli M2 shotgun. The Benelli M2 scope rail fits just in front of the factory rear sight for that low-profile factory look. The Benelli M2 scope rail will also fit the Benelli M4 scope rail if the factory rail is damaged or is missing from a used Benelli M4.