I mean do you want to know because they nerfed the hell out of it & is one of the more recent examples/debacles that either bungie has no clue how their own game works or dmg04 and cozmo are corprate mouth pieces and not community leaders.
They nerfed its boss damage, when the community pointed this out out cozmo and dmg said " no its not, show me a vid". Well it was proven with a video link it was indeed nerfed and they never spoke of the topic again.
[b]O its a 5% drop rate.[/b] I dont think they added bad luck protection either(1k voices has this, compounds chances maxing at 50%).