Systema Inner barrel (CQB-R model) #3 for PTW M4

Systema Inner barrel (CQB-R model) #3 for PTW M4 Suitable For Systema M4 PTW Series Airsoft Rifle Airsoft Guns High grade precision barrel at 6.04mm diameter Choose this barrel to suit your Airsoft Rifle model For custom upgrade user, you can choose a longer barrel