ZB-30
ZB-30 machine gun, cal. 7.92 x 57 mm.
In fact this weapon is the ancestor of the British-made BREN rifle which has been in service since 1937 in the "British Army".
For the record, the name BREN comes from the contraction of “BR” and “EN”, BR for BRNO (Czechoslovakia), and EN for Enfield, a borough of London.
This is a copy of the Romanian version also called "CUGIR".