Love this challenge;)
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Come on you don't need stacks if u have unlimited heavy ammo using coil glitch. I have just watched another video today where the dude had over 200 rounds in his merciless and shooting it in full auto the games mechanics are broken as hell titan baracade is broken if you want to cheese that's up to you but please don't make videos about broken mechanics and try pass them off as an achievement Bungie fix your disaster of a game