Jisho

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ホップアップシステム
Wikipedia definition
1. Hop-Up (Airsoft)​The term Hop-up, short for High Operation Power Up, describes the back-spin put on airsoft pellets and BBs to increase their range and accuracy via Magnus effect. Hop-up acts somewhat like the rifling on the barrel of a firearm, but without the increase in horizontal accuracy. Also, being light-weight, airsoft pellets are still affected by wind when fired.
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