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What is the 'hop-up' system in an airsoft gun designed to do?

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The hop-up system uses a small rubber nub to apply backspin to the BB as it exits the barrel, creating lift through the Magnus effect and dramatically extending effective range. Properly adjusting the hop-up is the single most impactful accuracy improvement any airsoft(Deals) player can make. Aftermarket hop-up buckings and flat-hop modifications are among the most popular upgrades in the airsoft tuning community.