Leapers, Inc. - UTG Model 4, Combat Ops S2, Stock Kit, 6-Position Mil-Spec Stock Assembly, includes Extension Tube, Buffer, Buffer Spring, Tear-drop Ring and Castle Nut, Black Finish RBUS2BM The Leapers UTG AR-15 PRO Model 4 Ops Ready S2 Stock is molded from high impact reinforced polymer materials. It features an ergonomically chamfered rubberized butt pad and a slanted cheek rest that enhances shooting stability and consistent firearm control. The stock has an integral sling loop and ambidextrous QD sling swivel housing. Lightweight and super slim" the stock has fully dehorned corners and melted contours for snag-free use. This kit includes a Mil-Spec receiver extension tube machined from aircraft aluminum with proper Mil-Spec rolled threads. The tube is hard coat anodized for corrosion and wear resistance.