Even if you get this gun it's not a guaranteed necrochasm. You'll have to wait until hard raid comes out, then you'll have to beat crota, and then you have to hope Rngesus blesses you. They aren't just going to give you the mats after one win. It's the vex mythoclast of crota. Just saying, people are still complaining about not having that one.
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I have it too. You need 500 kills on hive and eris level 3 to get the first upgrade. Use the first mission on the moon and kill all the thrall and acolytes then let the knight kill you. You get about 25-35 each time. Just some friendly advice