The UTG PRO Model 4 S2 Stock Kit is a complete 6-position mil-spec stock assembly designed specifically for AR-15 rifles. Molded from high impact reinforced polymer materials with ergonomic features for enhanced shooting stability.UTG PRO Model 4 S2 Complete Stock Kit6-position mil-spec adjustable stock assemblyHigh impact reinforced polymer constructionErgonomically chamfered rubberized butt padSlanted cheek rest for shooting stabilityIntegral sling loop and ambidextrous QD sling swivel housingIncludes mil-spec receiver extension tube buffer buffer spring tear-drop ring and castle nutAircraft aluminum extension tube with hard coat anodizingBlack finish with dehorned corners for snag-free useThis complete Combat Ops S2 stock kit provides everything needed for AR-15 stock installation or upgrade offering lightweight design with professional-grade durability for tactical and sporting applications.