The bolt carrier is an essential part any GBBR out there its what drives the BB to come out the other end of the barrel. In a real gun its almost the same and depending on the weight it will affect how the perform.
Constructed with lightweight aluminium, the RGW CNC Bolt Carrier for the KJ Works KC-02 GBBR is made for quicker follow up shots, giving you the upper hand in skirmishes or competitions