Some of the tooltips for these guns provide erroneous information, at least regarding weapon range:

M1928 Thompson -- Stated range 80m ----- | Effective range 100m
RPK-74 ----------------- Stated range 600m(!!) | Effective range 235m
AK-74 ------------------- Stated range 280m --- | Effective range 260m


All other guns seem to be correct, but for some it's difficult to verify with 100% accuracy because they cannot be fitted with a rangefinder.