BTR-K should be renamed as BMP-K.
BTR in Russia stands for armored transport.
Often unarmed, or armed with 7.62 and 12.7. Its main objective is to get infantry to the hot zone and move away. Its always a wheeled vehicle since 1970 when wheeled BTR was recognized as more efficient.
BMP is an equivalent of IFV. Usually armed with autocannon and AT weaponry. Even though it can transport infantry, its main objective is fire support.
Its always a tracked vehicle. {F20933} {F20934}
I agree with Nyama. The ARMA III BTR-K Kamysh is obviously (very) loosely based on the Ukrainian BMPT-64. Just for the reference of others I've included two images, one of the actual vehicle and another of the optional modular turret seen in ARMA III.
Additionaly, the Russian phrase for BMP, or Боевая Машина Пехоты readily translates as Infantry Fighting Vehicle.
Guys, thanks for the feedback. When naming the vehicle, we wanted it to capture its dual role of both IFV and a transport vehicle. In the end, we sticked with BTR-K, as a name that describes both aspects. The vehicle name also relates a bit to our inspiration (not the BMP) and stays close to the imagined development line we did for the vehicle.