I think guns like Techeun Force, Her Mercy, and Aplified "Geode" are very powerful but very underused.
Techeun force with accelerated coils has a charge rate equal to the frenzy, the current fastest charging fusion rifle
Her Mercy allows you to fire super fast without a major loss in accuracy, allowing for triple tap to activate quite often
Amp Geode has the same RoF/Impact profile as The Chosen, one of the best sniper rifles
Know any other guns that don't get the recognition they deserve?
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Wolfborne Oath. The fire rate is great for a shotgun, giving you a rapid second shot in case you can't seal the deal.