Now you can convert your front-wired RM4 to a rear-wired ERG! Using original Kinetic Feedback System assembly from your RM4 PTS ERG, you can use this package to swap buffer tubes and run your wiring through the integrated channel under the tube. This assembly comes with part 451, 452, and the four screws that retain the wire cover, part 398. Please note that this does not come with the buffer tube end cap, which is available separately, but is also the same piece that comes on the front-wired PTS RM4 rifles.
*Please also note that some modification may be required to rear-wire your wiring harness and KWA does not recommend converting your rifle while under warranty, as it will void any existing warranty.