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Hop-up is for backspin, to give the bb lift so it can counter the force of gravity and go farther.
A gun with no hop-up will still have some spin, but probably front spin. If it didn't spin at all, the bb would fly all over the place, just like a knuckle ball in baseball. This has to do with the turbulent flow around the bb/ball. If it spins enough, the low air pressure point at the wake of the bb stays in relatively constant position. With no spin, the low pressure point wanders around and disturbs the path of the bb/ball.
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