Amend2 Magazine, 40S&W, 13 Rounds, Fits Glock 23, Polymer, Black AM16A2GLOCK23BLK This Amend2 13-round magazine is designed for use in the GLOCK 23 and is a sturdy" reliable .40 CAL magazine made of advanced polymer material. It is a light" durable and excellent alternative to the standard GLOCK(R) OEM magazine.