External Barrel Extension Kit For Colt M4 Cybergun

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External Barrel Extension Kit For Colt M4 Cybergun

I present to you this external barrel extension kit for the Colt M4 from Cybergun. This kit will allow you to accommodate a larger internal barrel in your replica, going from the original 340 mm to a maximum length of 420 mm. It will include 3 elements: -A 90 mm external barrel extension -A barrel spacer for the external barrel. You will need an O-ring with an external diameter of 23.5 mm, an internal diameter of 19 mm and a thickness of 2.5 mm…