The original mag guide for the Glock, it works so well that it's specifically banned by name by IDPA, and from USPSA's "Production Division." The various plastic knock-offs are generally legal for one reason: they don't help you enough to make a difference. Specify shiny brass or blackened brass. Black-anodized aluminum also available on special request. Glock 19/23's with "tabs" protruding into the grip void (circa 2000-2008) will need to remove those tabs for the slug to fit properly. This variant does NOT fit the "Gen. 4" or "SF" frames. Due to U.S. State Department restrictions, we cannot ship this part internationally.