How many belt-fed machine guns are like the Browning 50 cal. mg in that the cocking handle has to be pulled back twice after loading a new belt of ammo? I wouldn't have thought that it just the Browning 50 cal. that had this procedure and, likewise, I wouldn't have thought that all or most belt-fed mg's required this?

I thought up this "geekish question" after watching a 1940's made wartime film yesterday which showed a number of new ammo belts being loaded onto Browning 50 cal. MG's and then the cocking handle being pulled back twice before the weapon was ready to fire.

I was/am under the impression that the MG42 only required the cocking handle to be pulled back once after loading a new ammo belt?
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