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Amazon.com : Evike ProWin/Dytac CNC Hopup Chamber for M4/M16 Series Airsoft AEG Rifles : Sports & Outdoors
![Advanced R-HOP Hop up Arm - M4 ProWin [Airtech Studios]](https://www.blackhawkairsoft.pt/9321-large_default/-advanced-r-hop-hop-up-arm-m4-prowin-airtech-studios-.jpg "Advanced R-HOP Hop up Arm - M4 ProWin [Airtech Studios]")