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For Strong Hop up & Long range Upgrade!Change your Original M4A1 MWS HOP Arm and get stronger hop upCNC Enhanced Aluminum Alloy+ Designed for GBB M4 Series!REAL GAS BLOWBACK TM M4A1 MWS STRIKE HOP ARMTokyo Marui GBB M4MWS is known for its stable accuracy, but with its original chamber hop arm, t..