The M2 is the workhorse of the Benelli semi-auto line. Light, nimble, but ruggedly built, the Benelli M2 is built around the ultra reliable Inertia Driven(R) bolt mechanism. The Inertia Driven(R) system allows the M2 to digest nearly any 12-ga. cartridge, from 2-3/4" target loads to the heaviest 3" magnums.