Can't complete Contract Killer.

Dear EA,

I've been away from the Star Wars Battlefront game for a while. I just got back to playing it and I'm trying to unlock these new weapons. But one of these Hutt Contracts, I can't complete for some reason. I'm doing the Contract Killer, to unlock the RELBY-V10 Targeting Rifle. I've already have 2 of the tasks done. Get 3 Targeting Rifle Streaks and get 40 kills with any heavy blaster. And all that's left for me to get is the Kill 15 Enemies with any targeting rifle, and that's the one I can't get done I keep track of the kills and it won't unlock what do I have to do? Get 15 Targeting Rifle kills in one round to get it, if that's it I need an alternative to getting that blaster.