The Advanced Technology Tactical Forend features two 2" Picatinny rails on the forend which provide for the attachment of optional accessories such as a flashlight or laser. Notes: Forend Package includes an adapter kit which allows installation to: Mossberg 500*/535/590/835, 12 Gauge, Remington 870, 12 Gauge and Winchester 1200/1300, 12 GaugeSynthetic forends on new Mossberg 500A cannot be replaced because action bars are attached to the forend