T-N.T. Studio TW System Retrofit Kit for Systema PTW/ DTW/ CTW (320mm)

T-N.T. Studio TW System Retrofit Kit for Systema PTW/ DTW/ CTW (320mm) Metal Construction HOP-UP chamber Setx1 & Inner Barrel better air-tightness, BBs feeding more smoothly!! No more jam!! No more BB broken!! and do not choose BB type ANYMORE! Suitable for Systema PTW/ DTW/ CTW Series Airsoft Rifle