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- Gas mask has a vision range modifier of zero, not sure if this has an effect in game.

I can't recall to have touched the gas mask at all. I don't think that it does any harm, at least I have seen none.

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- Omerta rebel base has a 9x19mm ammo box with 65430 bullets.
- Drassen airport has at least one 9x19mm ammo box with more bullets than allowed

That's a general bug with the sell boxes of some calibers: when being found they display an insane number of bullets, but when you give them to a merc, or place inside a vehicle, they start showing the correct ammount of bullets. You'll come across more of them.

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- There is a modified tactical flashlight in C13 Drassen middle sector

That shouldn't be the case. Can you recall where it was?

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I wonder if pilots simply shot this rifle from their seat by holding it in their hands, or if the rifle was mounted on the airplane somewhere.

It rather was operated by the second man.