I did not even know there was a Ruck AK. I like it better than the full one.
The proportions are better and it would be much more usefull for confined spaces and concealment. The katana's that are considered to be the toughest ever made are
forged by Howard Clark of S7. I know the reason his are so good is the heat treat
turns the steel to bainite which is very tough and springy. The really impressive thing he does is makes the edge martensite which is very hard and takes a razor edge. It would be interesting to put an INFI AK up against the S7 bainite/martinsite Clark katana. Another tough katana is the one I have which is way cheaper than even an Busse ruck a Cheness 9260. The cheness Shura or Tenchi
are through hardened unlike a traditional kat and are tougher than the same exact blade that is diferentially hardened. There are some great pics of the cheness eating a cement block but it does not take as big a bites as the DF.It is still pretty good for a 200$ sword.