The RBT-K47 FK is a fiberglass reinforced polymer buttstock system made to replace your stamped receiver AK-47 OEM stock with a State-of the-Art M16/M4 durable & lightweight collapsible buttstock systemAdvantages: Non slip design provides superior shoulder positioning enhancing tactical performance 8 positions tube for optimal fit of the stock length to your battle stanch Bolt on design for tight and easy fit on stamped receiver AK Constructed from durable & light weight fiberglass reinforced polymer composite Three integrated slots for sling attachment, one in the front and two at the rear Two ambidextrous metal Quick Detach rear sling swivel mounting ports No gunsmith required After market sized buffer tube Compatibility: AK-47 (stamped receiver) Variants.