FAB Defense M4 Buttstock for Moss 500 and Solid Piece Pistol Grip Black AGM500-FK. It features a rugged one piece adapter design features drop-in installation and a storage compartment in the grip for extra batteries. Specifications for FAB Defense M4 Buttstock for Mossberg 500: Mfg Item Num: AGM500-FK Supplier SKU: 20605 Category: STOCKS AND FORENDS Type: Collapsible Stock Firearm Type: Shotgun Firearm Model: Mossberg 500/590 Material: Aluminum/Steel/Polymer Finish: Black Positions: 6 Package Contents: FAB Defense M4 Buttstock for Mossberg 500 The FAB Defense M4 Buttstock for Mossberg 500 is a quality addition to the FAB Defense lineup. For more great deals on Shotgun Stocks by FAB Defense please browse our FAB Defense Gun Parts page. What firearm models does the manufacturer say FAB Defense M4 Buttstock for Mossberg 500 is compatible with? The manufacturer suggests that FAB Defense M4 Buttstock for Mossberg 500 is compatible with Mossberg Model 500 Mossberg Model 590Mako AGM500-FK M4 Style Shotgun Aluminum/Steel/Polymer Black