Those looking for the Inokatsu parts for the WE M4 in the US, you can check these out at Airsoft Extreme. These range from the RAS kit to a new whole receiver... New Inokatsu parts for the Western Arms M4. New Metal Body, internal par­ts (more durable), bolts, complete bolt, metal RAS, LE Style stock with buffer tube, outer barrel, front end sets and more! Click image to see all the items we have and for pricing."