When using a full face mask, I like to use a gun without a stock, or with a folding stock. This way you can line up the gun in front of your eyes without having to shoulder it. It is not as accurate as with a properly shouldered gun, but it's better than not using the sights at all. Anyway, if you are playing with a full face mask, you are probably playing in CQB, so long range accuracy is not much of an issue in this case.
Keep quiet. Sound travels faster than BBs.
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