virtual arsenal. trying mx rifle -crash; spmg -crash; trg(tavor) -crash; m20 rifle -crash; dlc markshmen rifle(d'nt remember correctly)-crash; connected silencer to any of - no crash; handgun weapon - no crash.
sound card - sound blaster x-fi or high definition audio on-board - 100% same result. changing audio driver or sound parameters on driver, or sound source count in game parameters(32-128), nor disabling /enabling sound card - same result. only -nosound startup parameter allow to continue w/o crash.

-nosound startup parameter - no crash.

another one test.
firing handgun - no crash. firing spmg - game crash.