From Hard Atheon. If you are trying to get one yourself, just don't give up... it will happen soon. Or hopefully Xur will sell it again before HOW to help teams have an easier time in Prison of Elders ,-)
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Edited by SagitarioSeiya: 5/13/2015 10:48:57 AMEvery Legendary Heavy Weapon engram I got was Machine Gun, i have almost all MG's in game, only 2 rocket launchers WITHOUT tracking, fragmentation bombs, or proximal detonation. When Xur was selling Gjallahorn I couldn't buy.