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I like this design. with a standard hopup, as the bucking presses against the sleeve and inturn the BB, the BB also presses against the opposite side or the sleeve which I would assume causes friction against the BB minimizing the full effect of the bucking.
Though I may be wrong, I can only assume on this design that the roller system can introduce more spin since it is continuing to press on the BB as it passes by. more positive contact is made between the BB and hopup for a longer period of time creating more spin.
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