The Magpul PRS GEN3 is the field-precision stock that set the standard for AR-15 and AR-10/SR25 platforms. Tool-less thumbwheels adjust length of pull and cheek height on the fly, so you can dial the exact position for prone, bench, or barricade shooting and return to it every time. The aluminum-reinforced build adds rear weight for a steadier hold, and it drops onto any mil-spec or commercial carbine buffer tube. Flat Dark Earth.