The Action Army Ver. 2 Cylinder Head is made from high quality Aluminum and is designed to fit the Ver. 2 gearbox. The Action Army series of upgrade parts are compatible with most major brands of AEG such as Tokyo Marui G&G ICS VFC KWA H&K JG SRC UMAREX Class Army Echo 1. Action Army is providing a cylinder head with 2 o-rings instead of just one. The extra o-ring provides a much better seal against the cylinder for maximum compression.
Double o-ring for maximum air seal and FPS output.Flat large bottom rubber mat made out of high quality rubber.
Compatibility Type: Version 2 M4, M16, M733, MP5, SCAR,Compatibility Brand: Tokyo Marui G&G ICS VFC H&K JG SRC UMAREX Class Army Echo 1