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 Adjustment Optic Rail Cutout Cushioned Nonslip Buttpad Fixed Sling Mounts and Steel Anti-Rotational QD Mounts Durable Composite Material Mounts 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 USA Weight: 12.5 oz Length: 9 in Width: 1.2 in Height: 4.33 in