Formula to grinding glitched weapons?

I’ve been trying for glitched shotguns ans snipers but I just put 3 random weapons in there and get a random gun. I’m just wondering if a rule exists like the 2 legendary 1 purple and what ever the purple is that is the gun type you will get. It’s just getting a little annoying getting 10-15 glitched guns and going to the grinder and getting nothing besides Assault Rifles and Rockets…

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