Just started comparing different models of the Carson M16 but the CRKT web site is not very helpful in categorizing the different variations. Can anyone shed some light on the meaning of the letters and numbers which come after M16, does it follow any logical format? Does anyone know if there is a retailers web site which does a good job of explaining the blade lengths and handle material variations available? I am especially interested to compare weight, as some of the models seem they might be on the heavy side. Thanks