My highest gunstreak was 28 in Sticks and Stones. I was sadly humiliated shortly after...
79 0 then died and used lethals and got 127 - 9 this was with xpr extended mags and fmj add me for video proof
Gun alone? Probalby around 5. I use lethals and knife as much as possible since I primarily play domination.
One guy got reset and had his account locked from prestiging the other day.
He had 200 thousand kills around prestige 4 and a 615.47 (about ) KD ratio on one gun.
funny thing is he claims he was legit