Leapers, Inc. - UTG UTG PRO, Mil-spec Stock, Black Finish, Fits AR-15, Compact Size, Includes Cheek Rest Plus Removable Extended Cheek Rest Insert, Rubberized Butt Pad RBUS4BMS This is a UTG PRO AR-15 Ops Ready S4 Mil-spec Stock molded from impact resistant high strength matte black polymer. Its unique 4.28" length with 4 position adjustability provides comfortable length of pull and ease of shouldering firearm when wearing a load bearing vest or plate carrier system. It is built for heavy duty use with the tightest tolerance controls to provide the most secure fit and function. Includes slanted cheek rest and removable 5.51" extended cheek rest insert" rubberized butt pad" reversible sling swivel housing and standard sling loop.