The UTG PRO Model4 Combat Ops S1 Mil-Spec Buttstock is a collapsible AR/M4 style stock constructed of weatherproof and rugged high impact polymer. This 6-position adjustable stock is designed for heavy duty operations with the tightest tolerances for secure fit and silent performance.UTG PRO Model4 Combat Ops S1 Mil-Spec Buttstock6-position adjustable/collapsible designAR-15/M4 style compatibilityWeatherproof high impact polymer constructionThick rubberized recoil padReversible QD sling swivel housingAmbidextrous sling loop attachmentDual storage compartmentsBlack finishChamfered edges and slanted cheek restBuilt for tactical applications and heavy duty use this stock provides the comfort and functionality needed for professional and recreational shooting with secure silent adjustment capabilities.