The Magpul PRS GEN3 precision stock fits AR-15/M16 and AR-10/SR25 rifles and delivers tool-less, repeatable adjustment of length of pull and comb height via its signature thumbwheels. Built for prone and supported precision shooting, the aluminum-reinforced polymer construction adds stabilizing rear mass while a bottom Picatinny rail and QD sockets handle monopods and slings. Fits any mil-spec or commercial buffer tube. Black.