B5 Systems AK Stocked Fixed, Fits AKM Pattern Stamped Receivers, Matte Finish, Olive Drab Green AKM-1500 The B5 Systems AK Stock fixed variant offers a drop in upgrade for the factory fixed stock. It features improved ergonomics" an adjustable length of pull" QD/fixed sling mounts and a cushioned buttpad. Proudly made in the USA of composite materials and steel hardware.