Strictly speaking, the back spinning effect created by the hopup function often produce uncertainty and can lead to poorer accuracy. However, we have to face the reality – without back spinning the bullets will not fly far enough.
The behavior of a poorly designed hopup unit tends to be unpredictable and unfixable. Test your hopup unit with 0.20g or 0.25g BBs (!!). If you find poor accuracy, be ready to shell out extra $ to get the unit replaced. In any case don’t expect accuracy with 0.12g BBs. They are way too light.
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