I wouldn't worry about the Mongol's even with a differentially heat treated Battle Rat.
Busse's heat treatment on SR-101 is different and tougher than a differentially heat treated Katana.

Most Katanas would fail against hard blows to cinder blocks - especially centuries ago. Not a Swamp Rat. <img src="/ubbthreads/images/graemlins/wink.gif" alt="" /> <img src="/ubbthreads/images/graemlins/thumbup.gif" alt="" />