The UTG PRO AR-15 Ops Ready S4 Mil-spec Stock is molded from impact resistant high strength matte black polymer with 4 position adjustability and a unique 4.28" length for optimal comfort when wearing tactical gear.UTG PRO AR-15 Ops Ready S4 Mil-spec Stock4 position adjustable with 4.28" compact lengthImpact resistant high strength matte black polymer constructionIncludes slanted cheek rest and removable 5.51" extended cheek rest insertRubberized butt pad for enhanced comfortReversible sling swivel housing and standard sling loopBuilt with tight tolerance controls for secure fitDesigned for heavy duty use and ideal for operators wearing load bearing vests or plate carrier systems providing comfortable length of pull and ease of shouldering in tactical situations.