Currency
THIS NEW amazing system was especially developed to replace and upgrade the entire GHK M4 hop-up structure. with the ongoing demand for quality upgrade parts for GHK M4, TNT AIRSOFT STUDIOS has developed this kit which includes all necessary parts including a gbb hop up bucking and cnc hop up chamber.
TNT APS-X Hop Up System Inner Barrel Retrofit Kit for GHK M ( 510mm )