Yeah the game needs VAL/Vintorez for quietly dealing with infected and players alike. However, the AK-100 series has not yet seen widespread deployment within the russian forces and should be rare spawns as well.
Good suggestion for a standalone, but not for the current version. Metal detectors / batteries would also need to be spawned if metallic mines are used. In case of minimum metal mines or even non-metallic mines, the blast will be the only indicator.