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Question about unlocking weapons

I am looking to unlock the Bronzelock Pistol and it says for the masteries required:

x40 Water/Earth
Progress: 32/32

What exactly do those mean? I gained a level and chose to upgrade my water mastery and it still shows the same numbers. It shows this when I go to the troops menu and and put the tab to Weapons, put the weapons I don’t have and click on Bronzelock Pistol.

Thanks for any help.

This thing is confusing.

I would say that once you will have clicked on both color for at least 40 times after leveling your hero, you would be able to unlock this weapon.