I think some of my weapons have that issue. Urgh. I feel like avoiding the game for a bit until they fix it. My PP-29 was almost at the end of Mastery 31, about 25/30. Now it is 0/30 for Mastery 31.
Yeah, I hear what you're saying. But you're damned if you do and damned if you don't. On on hand you avoid the stress of playing a buggy game but on the other hand you get behind on leveling up and potentially missing out on any content you may be able to grind for.
I might just do some solo to level up weapons I do not use. Or do a co-op with friends and see how can get the most pistol kills etc. Shoot * and laugh about it.
