There are a few tricks to make the BR a quick killer. One of these is the BXR tactic. This requires the BR wielder to get within melee distance of a target and initiate a melee then following up with with the reload button "X" and then quickly pressing fire. The melee will leave them with one headshot in them. Then by pressing "X" you will bring your gun back quickly for the speedy headshot. This all happens in a fraction of a second and works wonders at close range.
That will take practice, but makes complete sense. I'll just need to get better at performing melee attacks. I suggest having a few custom games where only melee is allowed. That would obviously make us better at it.