B5 Systems Collapsible Precision Stock (CPS), Medium is a black synthetic adjustable buttstock with an adjustable cheek riser, designed for AR-platform rifles with mil-spec carbine receiver extensions (M4/A5/M110K, tube not included). Features an adjustable cheekpiece and buttpad (up to 1/2 adjustment) with 10 internal tensioners, ambidextrous fixed and QD sling mounts, gross LOP adjustment via pull-down lever with lockout, underside M-LOK accessory mount, and color-matched steel hardware. Cheekpiece clears the AR-15 charging handle when fully collapsed. Weighs 20.65 oz. Safety note Follow all manufacturer installation instructions. Verify proper function and secure mounting before use. Comply with local firearm laws and regulations.