Re: the first picture.
That's an MG 42. Greatest machine gun ever made. Essentially every NATO-used machine gun is based on it. The MG3 is an MG 42, all of FN's designs are all based on the MG 42, which includes all of the machine guns currently used by the US military, the M-60 was an MG 42 barrel and receiver with new housing...
If there is a machine gun made in Western Europe or North America, it's based on the MG 42.