If you are trying to utilize your gasmask for real world training, then one of the best things you can do is to don it while engaging in airsoft battles.
This practice works well in Mobile Field Force training, Active Shooter preparation, Urban Warfare training, etc…
There are however, some things that you must know before you don your military surplus gas mask and head out into the fray.
The eye panels are not impact resistant. What this means is that if you take an airsoft round in the eye panel, you’re likely going to get a bullet hole in the panel, and if you’re not wearing secondary eye protection your eye can get injured.
Don’t wear it too long. This thing is made of non-breathable latex, and prolonged contact with skin can result in skin problems like infected hairs and rashes.
Your hearing and eyesight will be restricted. Many people don’t realize that wearing a gasmask restricts your hearing because respiration is more contained and is therefore much louder than you will be accustomed to.