HOP-UP adjust wheel for the whole round of two-way adjustment：
●More adjust range.
●More options for BB types
●T-N.T. - TR-HOP bucking / AEG / 60° *1
●T-N.T. - H+ Double I/D Air-cushion inner barrel 265mm *1
●T-N.T. - PTW HOP chamber assembly *1
※V2 The spring of the barrel has been removed