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AKS-74U PBS-4 5.45x39 sound suppressor (Silencer) in Escape from Tarkov. Flea market: 30,837 ₽. Traders: 32,991 ₽. The PBS-4 (Pribór Besshúmnoy Strel'bý - "Silent Firing Device") sound suppressor, manufactured by TsNIITochMash for use as a part of the "Canary" assault rifle grenade launcher system.