Amend2 Magazine, Mod 2, 223 Remington/556NATO, 15 Rounds, Fits AR-15 Rifles, Polymer, Black AM556MOD2B1520 The Amend2 15-round magazine is a sturdy" reliable 5.56x45 NATO (.223 Remington) AR15/M4/M16 magazine made of an advanced polymer material. It is a light" durable" and excellent alternative to the standard M4/M16 USGI aluminum magazine.