I've had 2 crap loops out of about 9 keys...The drop rate does leave a lot to be desired.
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Used seven keys now and farmed it when ttk first dropped and many times over. Only ever had the one that dropped in the very beginning. In hours and hours of farming over months and months. 1. I have more hours farming that one strike than most people i know even play destiny. That one weapon is rng nightmare on my profile.