With six positions, the collapsible stock can be used for a short carbine style setup or extended for a more stable firing platform. By squeezing the locking tab located below the stock and pulling or pushing the butt plate, you can adjust the length of the collapsible stock to achieve the perfect setup for your playing style. 100% composite material. Standard issue on the BT Assault, S.W.A.T. and Ironhorse, also compatible on any A5 style Marker.