Lol, nice darko, i got a 33 kill streak with the BAR, using a really weird class, you need to be really lucky though:
Perk 1. Boucing Betties
Perk 2. Overkill
Perk 3. Deep Impact
Tank Perk. Leadfoot
Weapon1. BAR (Bipod)
Weapon2. Double Barreled Shotgun
I camped in asylum on TDM, in the Top floor, near where one of the teams spawn on SnD, I placed betties in the most random pllaces, i got 2 double kills from them, and the 250, double mine challenge, i set up my bipod with the unlimited ammo glitich and waited for people to come, one person got really sneaky and tried to prone all the way over to me

I got a bit bored of the bipod because i couldn't aim out of the litte corridor where i was, so i shot a couple of people on the ground level.
I ran out of ammo on my BAR at about a 20 kill streak, usually i save the dogs for when i die, so i can start my streak over again, and call in 2 dogs, but i wasn't about do die, so i called 'em in, got 6 kills, thats a 26 kill streak, then went into the little kitchen bit, camped in the corner, killed 7 people going through