B5 Systems 5.5mm AK Fixed Stock Black. It features improved ergonomics" an adjustable length of pull" QD/fixed sling mounts" optic rail cutout and a cushioned buttpad. Proudly of composite materials and steel hardware. Specifications for B5 Systems Folding AK Stock: Manufacturer: B5 Systems Gun Make: Kalashnikov Gun Model: AK-47 Stock/Brace Material: Steel Finish: Matte Weight: 12.5 oz Length: 9 in Features of B5 Systems Folding AK Stock: Collapsible 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 pin. Due to the tolerance range of various manufacturers some fitment may be required. Package Contents: B5 Systems Folding AK Stock What firearm models does the manufacturer say B5 Systems Folding AK Stock is compatible with? The manufacturer says that B5 Systems Folding AK Stock is compatible with AK-47B5 Systems Ak Stock 5.5mm Black