I think a catalyst they could add that wouldn't be too strong is increase reload and require less pellets exclusively in pve. But in its current state anything other than that would probably result in bungie nerfing the weapon more than the catalyst even helps.
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Just run a single Solar holster mod on your legs and your problem is fixed.
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I didn't have any problems I was just stating that they couldn't change much without it being op which would result in a nerf.