Not to depress anyone, but I think we should honestly define what the gas masks are being kept for.
I have my mask for domestic disturbances that may require the local gendarmes to pepper the street with CS or OC canisters in order to "control" a riot or other mass disturbance. It is in this scenario that I see deployment of simply a gas mask without other protective gear which I do not own.
Having more knowledge about NBC than I ever wanted, I know for a fact that most commercially-available (and some military ones as well) are totally useless against weapons-grade chemicals designed to inflict mass casualties.
So I had two options: Prepare for the nightmare of chemical warfare by spending thousands of dollars on top-of-the-line MOPS gear, or simply accept that if NBC is used, I have a pistol with one bullet left.
Depressing, but true. But it does not prevent me from testing my gas mask, as well. It makes good sense to do so as long as you are testing against conditions you expect your mask to protect you from.
I believe this experiment was both valid and enlightening. Now, what kind of mask is it and what kind of filters were used?
And, now that you have tested it, have you dry-fire practiced while wearing it? I've found that the eye-hole type gas masks, vs the single-faceplate gas masks, are harder to sight a rifle while wearing. But the single-faceplate masks are more expensive. IMHO it's a valid trade off if you can find filters for that single-faceplate type.
Good luck and keep up your equipment. You never know when you might need it.
Panz
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