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FPS tune up kit for M4/M16 (KMAP1)This tune up kit includes:- Cylinder (CLTA)- Air Nozzle made of DELRIN with O-Ring for M4/M16 (SPM4P)- FPS Cylinder Head for Version 2 Gear Box (TC02A)- CNC ERGAL Double O-Ring Ball Bearing AEG Piston Head Pressure Deviation (TPAE)This product increases the performa..