Guarder Enhanced Hop Up Chamber For Tokyo Mauri M&P9L GBB Airsoft Net-Weight-(g)_990.0 Lastly the modified arm is

Lastly the modified arm is used to apply the desired force onto the trolley and then the R-HOP patch

Studio APS-X Hop-Up System with Inner Barrel for GBB (75mm)

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Stencils for applying camouflage patterns to competition

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Guarder Enhanced Hop Up Chamber For Tokyo Mauri M&P9L GBB Airsoft Net-Weight-(g)_990.0 Lastly the modified arm isGuarder Enhanced Hop Up Chamber For Tokyo Mauri M&P9L GBB Airsoft Aluminum Construction Airsoft Hop Up ChamberThis part is much more robust compared to the stock hop up chamber setSuitable For Tokyo Mauri M&P9L PC Ported Gas Blow Back GBB Airsoft Pis