T-N.T. Studio GHK AR Retrofit Kit for GHK M4 GBBR (320mm)
Want to increase the performance of your GHK M4 GBBR? Studio have released their new line of CNC retrofit kit which continues the T-N.T. consistent development purposes by simply installing this particular kit and playing immediately. The HOP-UP chamber structure as one-piece with better air-tightness in their Precision Air-cushion inner barrel so BBs are fed smoothly through the barrel.