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Maple Leaf's MR Double Air Seal Bucking upgrades the hop-up chamber on VSR-10 spring sniper rifles and compatible GBB airsoft guns. It's made from 75-degree rubber, a hard compound that resists deformation when shooting heavier BBs at higher velocities. The design includes a dual air seal system with a slimmed-down black ring to prevent air loss at the nozzle, which improves shot-to-shot consistency. A shield-shaped groove creates a wider contact patch on the BB, stabilizing its flight path for better accuracy at range. It comes in pink and fits standard Tokyo Marui VSR hop-up units.