(adsbygoogle = window.adsbygoogle || []).push({}); without using a sniper rifle. I just did it on crash with the scar and cold blooded. I thought it had to be a sniper rifle bullet but that is collateral damage. I was amazed because a lot of points popped up on my screen and then it said all pro and double kill.

I have all the pro perks if that's what you mean.

i think all pro is collateral headshot.. i think i got mine with a shotgun..

no he means the challenge, all pro. 2 headshots with 1 bullet.

i got it many times, but the best one was with a spas on quarry.

i got it for the first time with an m16 in invasion, epic, i nearly crapped myself.

i got it with akimbo 1887 before they nerfed

The 1st time i got it i was The Striker,
on wasteland in the bunker.

Ive gotten many times after.

Yeah, this doesn't seem too difficult after a while, I got it with a regular old sniper rifle...What I'd rather know is if people can get the challenges for emptying an entire magazine into enemies without boosting, cause I don't think I'll ever get them (aside from perfectionist, of course).

I got it with an RPD while spawn camping while the public lobbies were all glitches up with private matches.

And i also got it with a intervention headshot collatorial