if you want a full second DMR, just get a sportline ICS and upgrade the internals for a high-power pull as well as a hop unit and barrel. i wouldn't spend money on the kwa unless you want something ready to rock ~400FPS/lipo/NOT-a-dmr right out of the box (within reason)
i love my recently aquired sportline, i haven't had any compatability issues yet as far as aftermarket parts go *crosses fingers*