The B5 Systems AK stock 5.5mm variant offers a drop-in upgrade for the factory 5.5mm folding stock and mounts by the factory 5.5mm pin to the folding trunnion. It features improved ergonomics, an adjustable length of pull, QD/fixed sling mounts, optic rail cutout and a cushioned buttpad. Proudly made in the USA of composite materials and steel hardware.Features:Collapsible 5 Position Length of Pull AdjustmentOptic Rail CutoutCushioned Nonslip ButtpadFixed Sling Mounts and Steel Anti-Rotational QD MountsDurable Composite MaterialMounts to the factory folding trunnion via the 4.5mm pin. Due to the tolerance range of various manufacturers some fitment may be required.Made in the USAWeight: 12.5 ozLength: 9 inWidth: 1.2 inHeight: 4.33 in