Model No: GP-GBX004B – Enhanced Cylinder Set (M4A1) (B)

-For Marui Ver.2/3/6/7 Gearbox

-Piston & Piston Head Material: Japan PA

-Steel Teeth Material: Hard HRC 38ﾟ- 40ﾟ

Included:

-150% Spring

-M4A1 Cylinder

-Reinforced Piston

-Bearing Piston Head (SP006N)

-Stainless Steel Bearing Spring Guide (GBX013)

-Ver.2 Cylinder Head (SP040)

-Tappet Plate

Stock: Y
Weight: 0.135 kg