Originally Posted by inferno2inferno
An ego is a good choice but the way the grip hugs the frame will allow substantial amounts of cold air to enter the marker causing minor wear to the electronics. So best not used over prolonged periods of time. An axe is a good option since it is more airtight and can maintain it's performance for longer periods in the cold. Generally, markers with few orings on the bolt are the best choices as orings tend to not expand in the cold as they need to for marker performance; so the fewer the rings the better a marker will be able to handle the cold.
How does cold air cause minor wear on anything? Least of all electronics.
Electronics will work in at any temperature, temp makes no difference to electrical current.
And Orings don't expand or contract in the cold. If you start getting really really hot, like if you plan on playing on the sun, you may melt the Orings, however temp won't effect them.
What the cold will do is cause the dow to thicken, however, you have to start getting past -20* for that to start happening.
Whether enclosed or exposed, no matter what type of gun it is it all comes down to the paint. If you use high end paint in the cold expect poor results.
As the temp drops the paint grows more brittle, and high end paint is already brittle, so its going to get so fragile simply firing the gun will cause the paintball to shatter.
So, when playing in the cold, buy the cheapest paint you can find. And go light on the lube.