So I've played I believe 7-8 *350 Light Strikes and a Nightfall. And I have received ZERO of these so called Skeleton Keys. With friends I played with during these strikes only received one during that whole period of strikes. I don't know if my luck is just bad or if the drop rate is really low.
Edit: Thank you guys (and gals) for all the feedback!
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Drop rate is supposed to be low, they're how you get some of the rarest guns, they're not just going to hand them out to you. I've done about 20-25 spread across all my characters and both heroic and non heroic strikes and I've only gotten two excluding the one you get from the quest. Not a big deal. What's the point in making the gear strike exclusive if just anyone can get it with their 1000+ skeleton keys? A little unrealistic imo