Me and two friends grinded Omnigul for the Grask of Malock pulse rifle. After about 20 runs I had the rifle and bond and one friend had two rifles. Another 20 runs later, my third friend still hadn't got any drops whatsoever. Bungie really could do with putting a cap on the RNG for strike specific loot. E.g. If you've run it x number of times without a drop it should be guaranteed.