Extreme cold weather can cause the hopup rubber to get hardened and break. Release the hopup rubber after every game and apply sufficient silicon oil spray to the rubber surface. If it is snowing outside, the weather is cold enough to justify staying home rather than airsofting.
If your hopup does not produce the desired effectiveness, chance is that the hopup spacer is too soft.
As we all know, hopup requires friction in order to generate the desired back spinning action. Therefore, slippery surface on the hopup rubber is also no good. Quality of the rubber surface is one factor. Humidity is another. The quality of the BBs you use also has a role in this equation.
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