Re: Weapon trials not going through for R99 relentless

I read a helpful thread on reddit on this topic. 

Essentially, you need one-clip the enemy when they are at 100% full health and shield.  Any damage done by a team mate (or another enemy team), or by yourself, before you execute the hipfire one-clip, voids the chance of fulfilling the challenge. 

Let me know if this makes sense, otherwise I can hunt down the thread and link ti for you.  Good luck!