Panverine demonstrates the home-made GM6 Lynx Gas Blowback rifle and man that blowback is fierce. This is based on the .50 BMG Gepárd anti-materiel rifle (also uses the 12.7×108mm round) and the M6 is the last iteration of the rifle and officially called the GM6 Lynx. This was in use in the Soviet Union, Warsaw Pact and China. It is also used by Canada, UK and India.

Read about how it was made by clicking here and use online translation as this in Korean.