i'm pretty sure lore wise the golden gun is the weapons a hunter uses engulfed in solar energy, in theory you could also get a golden auto rifle however hunter usually use and cannons, lets say you have a hunter with malfeasance and a hunter with the last word:
the first hunter will have a golden malfeasance with all the characteristics of malfeasance
the second hunter will have golden last word with all the characteristics of the last word
English
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But since D1 the Golden Gun has been the Last Word in animation, why change it now for seemingly no reason?
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Maybe to fit the faster fire rate?