Board Thread:Fun and Games/@comment-10429682-20130613144253

There are a ton of different varieties of Metal Gear in existance. There's REX, RAY, ARSENAL, and EXCELCIUS just to name a few. This leads to the question, however; what is it that they all have that make them technically Metal Gears? Do they just have to be giant robot mecha things? If so, then that would technically make the Gekkos Metal Gears. So, what is it that all the MGs have it common that make them all considered MGs? 