B5 Systems Collapsible Precision Stock, OD Green, Medium Length Cheek Riser CPS-1308 The B5 Systems Collapsible Precision Stock (CPS)" Medium. Building upon the venerable cheek profile of the B5 SOPMOD and Bravo stocks" the Precision stock incorporates an adjustable cheekpiece and buttpad while fitting Milspec carbine receiver extensions. Features internal tensioners" ambidextruous fixed and quick disconnect sling mounts" gross length of pull adjustment via pull down with lockout" underside M-LOK accessory mount" and color matched hardware. The CPS Medium fully collapsed will clear the M4 charging handle. Proudly made in the USA.