-For Marui Ver.2/3/6/7 Gearbox-Piston & Piston Head Material: Japan PA-Steel Teeth Material: Hard HRC 38ﾟ- 40ﾟIncluded:-190% Spring-M4A1 Cylinder-Reinforced Piston-Bearing Piston Head-Bearing Spring Guide-Ver.2 Cylinder Head-Tappet PlateManufacturer : G&P
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