I'm pretty sure that an M1A1 is a V5 and V2 has the most problems in the cold, everything from V3 up seems to do OK. We played in -23 and all our guns were fine. If you are upgraded your gun won't do as well/ it'll break if you don't have complete upgrades. Daes used a G36 shooting 370 and it did fine but there isn't to much left that's origonal in his mech box. To the best of my knowledge
UPGRADES + COLD = BROKEN
One problem the Prince George Airsoft Club ran into was our hop-up was stiff from the cold and bbs were jamming from over compensating then the ruber actually moving and closing the barrel off to much. Run a wire extension into your sleave and into a pocket to keep batteries warm or tape on a hot pack from marks work wear world so the battery doesn't die.
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