How do I change the active element of the Murmur fusion rifle?

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Having recently completed some of the The Dark Below story missions in Destiny, Eris Morn gave me a special legendary fusion rifle, the Murmur.
It says that it can toggle between arc and solar damage, but I've pressed every button and combination I can think of and haven't had any success.
How do I toggle the elemental trait of the Murmur?
Best Answer
Open your inventory, press Y/Triangle on the weapon, and toggle the active element on the far left as if it was an upgrade.
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How do I upgrade my murmur?
Whether you main PvE or PvP, you'll want a few Fusion Rifles in your arsenal....Destiny 2: Top 10 Fusion Rifles, RankedWhat is the best fusion rifle for PvP?
Range on fusion rifles will determine the velocity of the projectiles that are fired from the weapon. Fusions have travel time and are not hit scan, so a high range stat will improve the travel time by shortening it since the projectiles travel faster. A high range stat will also boost the accuracy of the weapon.Destiny NEW Legendary Fusion Rifle \
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