Not sure how much longer they’ll be at vendors, but go BUY, BUY, BUY, BUY multiples to use to augment your current stuff:
Theater vendor has +10% damage to Assault Rifle gloves (item level 474)
White house clan vendor has +15% all weapon damage chestpiece
Was happy with a low 15.1k dps AR I found this week but these recalibrations boosted its damage up to 18.8k.