With a drum mag, my CA G36 is essentially a MG36. Internally I installed a new spring, spring guide, piston and piston head (the latter two because CA guns chew that thing up quickly). You don't wnat your ROF to be too high, as it is if you get a drum mag it'll have a hard time keeping up even with a stock gun.
My STAR C Mag doesn't feed my MG36 fast enough and on a warm day causes it to dry fire once every 5-7 shots. On cold days it can be once every 3.
kalnaren you can run the G36 for longer periods of fire although it's not as "realistic".
