What is the longest range Martial Arts that does not involve weapons?
Yes, you got it right when you said kicks. Legs are longer than your arms so kicks are the natural weapons of the human body which has the longest range. Any kick whether it is to the front or side or back (or spinning for that matter) is actually longer than a punch so long as the kicker makes it a point to use the full range or length of his legs to extend it past the point where his arms reach. doing otherwise by keeping yur kicks short or pulling back on them does not give you the range and the power you want. and with that distance it would be better to punch (or use low/leg kicks). A solid example is Muay Thai’s foot jab (or what other people call the push kick) or Tae Kwon Do’s side thrust kick. These are techniques that utilize the whole length of the leg starting from the hip to the foot.