Talk:Mastery Rank/@comment-11257220-20130628152837/@comment-188.178.249.231-20130630154516

you get the same amount of mastery for every level, and once an item reaches lvl 30, you can never get mastery points from that item or any copy of it ever again. Single guns and dual guns count as seperate items. Depending on how high a rank you intend to reach, it might be worth leveling them fully. For instance, if you level an item to 25, and then sell it, you might later need the last 5 ranks of mastery points, but to get them, you need to level it back up from 0 to 25.

I suggest you rank each item to 30 and be done with it, in the long run it will be worth it.