If you think about how airsoft guns are made, like AEGs, it will answer a lot of questions:
Battery powered electrical motors and mostly plastic and light metal construction. Or using compressed gas. Or using spring power alone.
Add cold and water to that mix. What do you think can happen?
-electrical systems failure
-brittleness of the materials
-gas guns will not work due to the temperature
Check our Information section, then the Teams and Events sections to find what goes on near where you live. Then, honestly, go see in person. Thank me later after you've gotten to see, ask, and try.