You can always break out a standard non ported barrel for rain play. I keep my original autococker barrel for just suck occassions. It isn't all that loud with a low pressure setup.
Additionally if you can find a hooded jacket, rainponcho, etc use it. Put the mask on first then cover the mask visor with the hood. This will help keep water from finding its way in the lens. Fog can be removed by running a fan or whatnot, but actual drops of water on the inside of the lens can be a killer to your game.
Most of you have seen my DIY cover on the top of my mask. Is made from a water prrof material for just that reason. Ever since installing it rain days are no longer a bother to me. Atleast it doesn't rain sideways here like in florida.
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- They call me Ivan
Who Dares Wins
"I've Got Shomting for You"

ivan at arctrooperspaintball dot com