I don't know if it's part of the Jackolyte buff or not but I used one as soon as I got it, went to the Moon on patrol and started punching Hive to death to conserve ammo and within ten minutes got a Legendary Engram and then a blue one. Once more not sure if it was because of the buff or if RNGesus is favoring me today or something... EDIT: Also I was only about 12-15 minutes into killing things before I hit monkey and weasel Hell so yeah...