This UTG PRO AK Mil-spec Collapsible M4 Stock Combo Kit with adapter is compatible AK-47, AK-74, AKM rifles with stamped receive it replaces your existing AK butt Stock. This Tactical AK collapsible stock includes high-strength impact resistant polymer stock assembly, Mil-spec 6 Position Extension Tube from Aircraft Aluminum with Hardcoat Anodizing, Locking Ring and Gen II Elevated Cheek Rest Stock Adaptor. Easy and User Friendly Installation to Replace AK Fixed Stock with Collapsible, Variable Length Stock and Upgrade to a New Tactical Look.• AK Stamped Receiver Adaptor Permanently Attached to Extension Tube for Enhanced Stability..Integral "Shark Fin" Design on Adaptor for Additional Sling Attachment Point. Upgrade Your AK with This Kit to Outperform with Better Stock to Center-Bore Alignment, Optimum Cheek Weld Height and Improved Weapon Handling Ergonomics. UTG One year limited warranty.