Mastery Rank 14 Possible Bug / Xp Progress Bar Stuck in PC Bugs Posted April 19, 2014 · Edited April 19, 2014 by Jeeva Hey KenCX, You only get mastery XP for the first time you level gear to 30. The only way to get additional mastery XP is to level new gear. Sorry about that! A reasonably easy way to find what gear you have left to level is to go to the weapons tab, in the Codex. If you're sorting by Rank, anything with a star is something you've 30'd. Anything at the bottom of the list (missing a star), you can still gain MXP.