i've got an m16 with the aus 4 and have carried it on and off for a few months now and i don't have any complaints. No the aus 4 isn't my favorite blade steel but so far it has done fine. yes you do have to sharpen it a little more often but other than that and the original blade grind i have no complaints whatsoever. either give it a chance, you might like it, or as mentioned above take it back to wally world, they're pretty easy to deal with. later,ahgar