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FPS tune up kit for M4/M16 (KMBP1).This tune up kit includes:- FPS steel cylinder type "B" (CLTB)- 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 i..