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I found it on youtube

u have to empty your clip. why his handgun has no ammo. in the middle of the knife buy the perk. to get the perk when u want. just empty your clip and knife. helpful cuz u can do it and when you get downed you can knife and get the perk.

ill give this a try later but does it work on any of the maps?

i'll try it on my ps3

Cool, I just did it, I'm gonna try and see if I can get more than 4 perks.

Without ammo? Thats the only thin i diddnt tried

EDIT: NVM it works great! Thanks
I believe it works on any map because i just tried it on shangri la and it worked. But that was on solo. But i'll try on multiplayer see if it does.

Didn't work for me, I tried doing it multiple ways. Does the power have to be on? I was playing solo on ascension trying to get quick revive, just to see if the glitch still worked. Thanks.

i tried this eariler and couldnt get it to work wat am i doing wrong?, do u have to have no ammo in the handgun or does it matter which gun it is?

plus when thinking about this now is this a glitch if he is still losing points? in the videos in loses points for the perk during the 2nd knife so wat is the point? or am i missing something

Edit:
Nvm.
I will as of RIGHT NOW, confirm it working on ps3.
1. Go up to the machine as close as possible .(part only tested on quick revive --> to the point where you hit the machine, but dont see the Buy "INSERT PERK HERE" for "PRICE".
2. Knife once, Knife again.
3. As soon as you knife square or X(if on xbox) and Run backwords.

on Step 3 make sure your run back and hold it at the same exact time