NOT LOOKING FOR TRADES ANYMORE! Here I have is my MK18. As far as I know the reason why it's not working is because the SHS 13:1 gears inside have been stripped. I took the motor out to find out the bad news yesterday. To my knowledge as I bought this off someone else for $400, the PARTS LIST : Rhop'd ZCI Barrel King Arms Gearbox AOE Corrected + Sorbo Pads Shimmed (Needs to be redone) SHS 13:1 Gears (Stripped) BTC Spectre Mosfet JG Blue Motor DD 9.5 Inch rail (black but painted) Magpul Pistol Grip Black Eotech Stubby Grip FMA Peq 15 (Optional) When it was working it was very snappy on semi and really fast. Trigger pull is smooth and short. Other problem I have seen is that the selector switch (Echo 1 receiver possibly) sucks ass. Doesn't click into place but you'll know when you're in semi. Overall this gun is great other than the fact it's not working haha. Looking to get $250 SHIPPED for it as it's probably just an easy fix of swapping out the old gears and getting new ones.