Today, if you were one of the many that found all of the hidden Ghosts in the daily "Paradox" mission, you may have found a new quest waiting for you with Lakshmi-2 in the Tower. Completion of her quest line will result in you earning the No Time to Explain pulse rifle.

Kdintranet on Reddit provides a step by step on how to earn this weapon.
The Quest

Once completed, you will be given No Time to Explain, which has the following perks.
Full Auto - This weapon can be fired in full auto mode
Speed Reload - Reload this weapon quickly
Hand Loaded - This weapon is effective at an extended range.
Fitted Stock - Increased weapon stability
Rewind Again - Precision hits are immediately returned to the magazine