Series 4 aircraft produced in Leningrad had the two 12,7mm synchronised Berezin. Those produced elsewhere had one removed. The Leningrad aircraft only went to one 12,7mm BS gun when the Series 8 production was introduced which also saw the removal of the pair of ShKAS. So the in game Series 4 is not incorrect, it is just perhaps incomplete. Things are made murky by unit armourers removing weapons too.
Also, Series 1 aircraft did not mount a synchronised Berezin firing through the hub. The weapon was an unsynchronised BK nominally designed for wing mountings. UB 'family' was perfected a little later, most early war production aircraft had the not fully developed BS & BK versions of 12,7mm guns.
I'd like to see the LaGGs redone. There are some quite interesting options available.
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