The Vexcor-Bettier (VB) light machine gun was copied by Vexcor-Armstrong Company according to the French-designed Bettier machine gun. Machine guns are air-guided, air-cooled and can be hit at any time. It has a reducer. There is a long-stroke air guide piston in the lower air duct of the cylinder, and the locking mode is realized by vertical inclined locking. There is a locking lug at the top of the bolt, and the ammunition is supplied from above the barrel with magazine.
If you want to know more about the difficulty of making VxBettier light machine gun, it is recommended to consult relevant literature or professionals.