M4 Folding Collapsible Buttstock for Remington 870FAB Defense AGR 870 FK folding and collapsible Buttstock for your Remington 870 provides you just what you need for a superior upgrade. The AGR 870 FK kit is available with a standard, lightweight GL CORE buttstock or the GL SHOCK shock and recoil absorbing buttstock, specifically designed to mitigate the recoil of your Remington shotgun. Available in Black, Tan or OD Green. Advantages Rock Solid One Piece Ergonomic Design Special Non Slip Texture,