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[others] GBB操作原理一問

隻o ring 係當飛標向前關上之後,氣流向後走時谷住啖氣推後隻煲
試下唔上o ring 打一槍睇下隻煲仲行唔行到咁後你就會明
M14愛好者

Guns don't shoot people,people shoot people.

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