The gear guide on the home page says:
"Mora Knife Model 731 (carbon steel balde), Model 748 (stainless steel blade) and Model 2000 (The Mora is favored by a number of survival instructors as a practical and inexpensive fixed blade, though less robust than the blades above.)
Are the new 'robust' Moras as good as the other recommended knives?
qjs
Mora (Frost and KJ Erikson) used to produced knives in approx 3 different sizes (3.5 to 4") for general use. The newest knives have thicker steel (3.2 mm instead of 2.2 or 2.5 mm) Thinner steel is easier to slice and dress game/fillet fish.
Mora has been coming with better (ie. more stout) knives the last few years. Quality wise they are as good as ever but they have been quielty doing things like the Robust HQ and the newer Bushcraft and Companion HD knives. The slightly longer Bushcraft Black Heavy Duty has about a .3" longer blade and a slightly longer tang (3/4 length instead of 2/3) and with a black coating and sharpened back spine and 27* edge (better for splitting and edge retention) instead of their traditional 23* edge. I have the Robust and its a great knife; I also have 3 other Moras but
I am so tempted to pick up the Bushcraft Black HD even with the steeper price tag of $47 vs $24. It seems Mora has been listening to the survival schools for beefier hardware and they are delivering. Heck the Bushcraft Black has even "bulletproof" advocate Dave Canterbury singing the praises about it. I use mine a fair bit for moderate batoning and have yet to break a knife blade yet.
Ramblin' Jim has a bit more on his commentary.
http://www.ramblinjim.com/articles/mora-knife-models-explained-and-compared/