I thought it was random....?:confused:
It is random I have had 200 kills now, and have 2 Perks and a Pack-A-Punch, I am round 11 ATM obv got QR at round 0/1 then got Pack-A-Punch at round 4, them got Speed Cola at round 8 or 9. It is not when the hand is in the Red :p Else in the 20-30 rounds you will get at least 2 perks a round :p
EDIT:
Round 12: Jug, Seems there random each game, I have had some every 5 rounds, or some every 4 rounds :p