I got the one way ticket 000 rocket launcher i got it equipped and i have been doing Iron banner from rank 0 to 2 and half and it hasnt got a single xp point but ny swordbreaker shotty is leveling normally. Is it a bug?
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Are you actually using it? Weapons only gain XP when you use them to get kills OR by turning in bounties with the weapon equipped. You likely use your Swordbreaker a lot in IB but you don't get the chance to use your rocket launcher too much