1. I noticed that there are now some German units armed with the MKB42(H) assault rifle. It has a range of 6, compared to the range of 8 of the StG44 assault rifle. This seems strange, considering they use the same ammo and are virtually indistingiushable for the untrained eye.
I don't think these rifle are different in a way you can simulate on SP WW2s scale.
On a more nitpicky note, the first units to test these weapons were infanterie units in Army group north in april 1943. It seems weird to have them only in the hands of SS and PzGren.
2. All Finnish infantry use the Lahti lmg right through the war, while in reality these were mostly replaced by the Russian DP lmg during the continuation war. Especially by 1944 the DP outnumbered the Lahti in front line units.
3. The Tokarev SVT40 rifle was actually replaced in production by the Mosin Nagant during the war, yet ingame they even seem to become more common in 1945, with several new units becoming available using it and new AT grenades.
In terms of Russian equipment, the following weapons could be added to the toe for some more variety.
Fedorov Avtomat
This was one of the first assault rifles, ebing designed during WW1. It was used during the Finnish winter war by soviet ski troops. In gameplay terms it would probably be rated similar to the StG44, using the arisaka 6.5mm round in semi and full-auto fire.
Tokarev AVT40
Basically a full auto version of the SVT40 rifle. It was used in small numbers starting in 1943 to combat a lack of light machine guns in the Soviet army. You could have a stripped down infantry or conscript squad using it instead of an lmg, or possibly as an option for smg teams.