The VLTOR RE-47 AK47 Modstock Adapter and extension combo is a direct replacement for the standard fixed AK-type stock. With this adapter installed, you are able to affix most M4 type collapsible buttstocks onto your AK, providing you with five positions to change the length of pull desired. The RE-47 will accept most MIL-SPEC dimensioned collapsible type stocks. This five position receiver extension is made from impact extruded 7075-T6 aluminum with hard coat anodized finish. It has a watertight storage compartment that is accessible from the rear and ambidextrous single-point sling mount.