Series 2 Hexmag magazines are made with the latest technology in materials and manufacturing processes this gives you a more robust and durable AR-15 magazine. Magazine now has a revised feed lip profile, which means greater rifle compatibility. Made with; PWS, Armalite M-15 Competition, Stag, Anderson Manufacturing, Smith & Wesson, Ruger, Daniel Defense, and Mossberg rifles in mind. Easier seating on a closed bolt and greater retaining power is made possible with a revised catch-pocket and lead in ramp. Easier loading, now made with stripper clip grooves.