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The answer is yes If you are trying to save enough coins for next week and want enough left over to buy next weeks chance of heavy weapon . 17 gets you gjallerhorn / Truth / insert heavy weapon
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You cant buy heavy weapons from xur unless he is offering one that week, which he isnt this week... If you want to upgrade the weapon you need the 300 damage version, 7500ish glimmer and an exotic shard