Black River Manufacturing Elite Benelli M4 Collapsible Shotgun Stock Carbon Fiber. Its many precise adjustments will give you a custom fit and feel to your Benelli M4 Shotgun. Shoot in complete comfort with Black River Manufacturing patented SHOCK FORCE recoil system. Specifications for Black River Manufacturing Elite Benelli M4 Collapsible Shotgun Stock: Manufacturer: Black River Manufacturing Gun Model: Benelli M4 Gun Make: Benelli Gun Type: Shotgun Stock/Brace Material: Polymer Condition: New Features of Black River Manufacturing Elite Benelli M4 Collapsible Shotgun Stock 6 position adjustable stock for precise length of pull 5 position adjustable cheek comb for precise sight alignment AR style buffer tube Rubber overmolded pistol grip Ambidextrous QD Swivel sockets SHOCK FORCE recoil system (stiff spring tension) QD sling swivel Package Contents: Black River Manufacturing Elite Benelli M4 Collapsible Shotgun Stock What firearm models does the manufacturer say Black River Manufacturing Elite Benelli M4 Collapsible Shotgun Stock is compatible with? The manufacturer says that Black River Manufacturing Elite Benelli M4 Collapsible Shotgun Stock is compatible with Benelli M4Black River Manufacturing BRPBCSCF: Elite Benelli M4 Collapsible Shotgun Stock Carbon Fiber