i have doubts about the ability of their upper mechbox to withstand the strain of that spring. the gun should shoot about 390-400fps and that's pushing that box right to the limit. i would also get another upper mechbox (empty) assemble your new parts in that one and keep your stock upper just in case. the lower mechbox should be fine to upgrade though. just remember that tappet, selector, anti-reversal latch must be ics. other manufacturers will not work properly. also change your motor end plate as ics motor is larger on the bell ends than marui compatible motors and you want your motor mounts to be as stable as possible. i tried this weekend to put an ics motor into a marui and she was a no go and i had to scrounge up another marui.
|