B&T AIR SPR300 PRO Upgrade Kits BTA-UGK-005Compatibility: B&T AIR SPR300 PROMaterial:PolymerOversized Hop Up plate for B & T Air SPR 300 PRO Rifle. Oversized hop up plate increases hop up contact patch area for increased lift when using heavier BBs. Suitable for 0.4g < BBsNew version offer better balance for BBs'.



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