Mk18 Mod 0 build i did from a kwa Ronin Maxx HopUp Flathopped 6.01 tbb Shs nozzle Shs piston Shs head Sorbo pad Wired to deans in buffer tube. Bolt stop function with proper mags. Or use normal m4 mags I’ll include real KAC front grip, rear sight, peq-2 ( don’t work ) 1 mag Shot like a dream