i think a new idea for guns should be dual or even all three elements in a weapon that change which element it is with each shot
for example an auto rifle with solar and arc that has 30 in the mag and ever other shot is solar and vice versa with the arc
another idea would be from this is a exotic fusion rifle that fires three rounds one of each element when fired. I think it would be something new and different to add to the game
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An exotic scoutrifle with 3 separate barrels. Give it "element swap" as a base perk, make it a super fast firing rifle, with each shot changing element. It's exotic perk could be "Triforce", which would make it full auto and add high calibre rounds.