First wintergame with my KJW M4 was OK. Temp was about 40 F, the rifle did OK inspite the cold weather. No problems exept that the hop-up was impossible to set with white ammo and the snow. Since my hop only moves in the last 3-4 settings it´s not that perfect in the summer either.
Anyway, played 2 games with my KJW and 2 games with my AEG (same problem to set the hop here - snow and white BB = ).