If you look at the rate o fire of the weapons, they have a fire rate of 750 rpm (rounds per minute), when they should have 600 rpm (AK receiver standard RoF). Some say that the 74 variant has 650 rpm, but I haven't seen any source that states it.
Can be seen in-game by looking at the top left card on ACE Arsenal (ACE loaded) and by testing (CUP only). To test it you can set a timer at 3 seconds and fire, at full auto, a 30 rounds magazine. It should stop firing at the exact 3 s mark, which would match the 600 rpm (the AK matches it exactly, the RPK doesn't). The counter-test, which certifies the incorrect rate of fire, is to repeat the original but with a timer set at 2,4 seconds, which matches the 750 rpm exactly.
Info sheets (non-official, no official found) used as sources for this post:
- Rosoboronexport "Rate of fire, rds/min 600";
- Military Wiki "Rate of fire 600 rounds/min (RPK), 650 rounds/min (RPK-74)";
- Министерство обороны Республики Беларусь (Belarus Ministry of Defence) "(Russian) темп стрельбы, в/мин" (Rate of fire, rounds/min).
The error can be found on both Release and DEV branches.
Thank you for your attention and the mods!