This is a used Glock Gen 4 Glock 21, 21SF .45 ACP 13-Round Factory Magazine. Magazine shows general signs of wear from use. This magazine fits the following models: Glock 21, Glock 21SF, Glock 30, Glock 30S, Glock 41. Will NOT fit Glock 21 SF with front mag catch. Due to the nature of the listing condition may vary from photos shown in listing. Buy online today!