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FPS tune up kit for MP5.This tune up kit includes:- Air Nozzle made of ergal with or for MP5 (SPMP5E)- FPS Cylinder Head  for Version 2 Gear Box (TC02E)- CNC ERGAL Double O-Ring Ball Bearing AEG Piston Head Pressure Deviation (TPAE)This product increases the performances of your AEG.100% MARUI ..