Inner Barrel/Hopup Rubber Option for KJW G23
 

So what is the option to change the inner barrel/hop-up for KJW G23? The hopup design is based on the TM G26, which is the original TM design, but that has since change to the current universal TM design. The 2 cut in the barrel that is used to locate in the hopup chamber is at a different location than the current design, and the rubber is slightly shorter also. Who makes these part for the KJW?