The Black River Manufacturing Collapsible Stock is the perfect addition to your Benelli M4. With its many precise adjustments, its sure to give you a custom fit and feel to your Benelli M4 Shotgun. Shoot in complete comfort with the patented SHOCK FORCE recoil system. Features6 position adjustable stock for precise length of pull5 position adjustable cheek comb for precise sight alignment AR style buffer tubeRubber overmolded pistol gripAmbidextrous QD Swivel socketsSHOCK FORCE recoil system (stiff spring tension)QD sling swivel