I G B barrel for handgun for GLOCK - original form cal. ?? Model ?? barrel length ???

IGB interchangeable barrel GLOCK Gen3&4 original dimensions barrel length up to 7.5" possible, please specify when ordering thread and porting completely tested according to German law For a properly functioning casing ejection when using the 9mm barrel, we strongly recommend replacing the original .40 or .357 control block with the 9mm block. This 9mm control block usually also works perfectly for the original calibers .40&SW as well as .357SIG and therefore does not need to be replaced every time. available GLOCK control blocks Due to manufacturing tolerances of the barrel and slide, minor fitting work may be required, which should be carried out by a competent professional.