1.1 Interim. When the MAK Axe was in the game, it could only be given out by MorninAfterKill or DjArcas. The axe was given out to those who sent in pictures or videos of their worlds. If MorninAfterKill liked the world, he would send you a MAK Axe unlock code.
Though not available in FortressCraft main any more, it is still obtainable in the FortressCraft Player Pack mod for the PC version of Skyrim.