I did my own research, and yeah it is GP-5 gas mask. As a person who has red a book about soviet equipment and etcetera on Russian, I say that it is
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GP-5 | Gas Mask and Respirator Wiki | Fandom
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Chernobyl liquidator kit, consisting of an OZK overcoat, OZK boots, gp5 gas mask, and NBC gloves : r/Impression_Kits
Soviet GP5 Gas Mask and Filter,
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GP-5 gas mask - The Official Escape from Tarkov Wiki
