I don't think use KJ or other Marui's copy is a good idea as the best part of Marui is its Hop-up set, and the original TM parts is much better than its copies. Also the surface of TM's outside parts like slide stop, grip safety were oxided black when most of Marui's copies use painting, which thecolor won't match Prime, PGC or other Metal slide& frame kit well and the painting be ugly after you use it for sometime.
