Mission First Tactical MFT Window EXD Polymer Magazine, 223 Remington/556NATO, .300 AAC Magazine, 30 Rounds, Fits AR Rifles, Polymer, Black EXDPM556-W-BL High quality components and precise manufacturing make Mission First Tactical ideal for both new shooters and experienced gun owners. The durability" reliability and excellent build quality will provide years of service you can count on.