nearly all his weapon avg damage stats got increased by 40-70%
it's nearly impossible even for dm mode, but he play only rush and some conquest mode

also he have got nearly the same hs\k ratio for all weapons even with sniper rifle
it's look like aimbot customised to have near 20% hs\k ratio and used for all weapon types

at last, if we imagine a guy, who always shoot at close range(<15 methers) at deathmatch mode (at rush mode it's impossible) and have good kpm, then he should have good accuracy, because it's hard to miss at close range for normal player, but this guy has avg accuracy

all of this clearly points for cheater who uses cheats with not very annoying config like typical cheater who use config with 100% acc, hs\k and etc