to put what he said in english, get 120 kills
You get 100 or 200 kills with your second primary weapon
First of all, perks are upgraded by completing a series of perk challenges. To get a perk uograded to "pro", you have to complete 4 of the perk challenges. So, to get Overkill Pro you must complete the challenge called Overkill Pro IV, which is completed by getting 120 kills with your second primary weapon.
Just reach rank 47.
no way MW3 is pro it has no glitches and the graphics are pro
250
Time and Practice.
no sir
By using them extensively and completing challenges with the perks
Yes, when playing MW3 and you have a specialist and you unlock a certain perk so many times it does become pro.
mp7 silenced fmgs akimbo and silenced slight of hand assassin pro dead silence pro
What you have to do is kill enemies while they have a UAV up. Don't destroy the UAV but you need to get assassin pro IV (4) to beable to have assassin pro. Hope this helps. ;)
With Overkill (if you have it) Use the scoped mosin nagant bolt action rifle as the first and the any Semi-Auto rifle with sniper scope or telescopic sight as the second with Moltov, gas, primary grenades x2, Overkill, and iron lungs.(it doesn't matter about the vehicle but i use water cooler or Coaxial machine gun!) Have Fun Playin COD 5!! :) :)