How to change the button mag release size on your HK VP9B....they all come with a medium and the S, L, XL and tool are available now at the HK Webshop. Be aware, there are 2 VP9B frames....one has a pin with the button release and the other does not have the pin. This video shows the swap with the pin.....without the pin is the same but no pin
www.hkwebshop.com
