As far as Danville goes, anything other than a stock length unmodified emitter may draw unwanted attention. The Tamiya battle system specs is pretty much the standard. As long as the system you are running is compatible or equal too , you should be fine. The distances that you are going to see on most battle fields is in the forty too sixty foot mark most times anyway. if you can minimize the scatter that is all you really need. 100 ft is probably going to be the longest shot you will ever see in all practical cases but by then you are probably going to get multiple hits if other tanks are near your target and that too is when you will see complaints that is why it is best to have the inside of the tube painted black to cut down on the refraction on the emitter.