Size Medium US military M40 Gas Mask. Includes Mask, Carry Bag, new charcoal filter. The item "M40 Gas mask US Military Army protective" is in sale since Friday, September 11, 2020. This item is in the category "Collectibles\Militaria\Surplus\Personal, Field Gear\Gas Masks".The seller is "warhorseworkshop" and is located in Phoenix, Arizona. This item can be shipped to United States.