The "average accuracy" for utstats is not accurate for profiles, only matches where players' have not reconnected are accurate.

What the site displays

15176 Shots	6716 Hits 	47.65%

"Real stats based on the weapon numbers"

15176 Shots	6716 Hits       44.25%

But if you look at the bottom 2 games, 26% accuracy, 24% accuracy, then almost a month later 43% and then 55.88% accuracy and then that's his new normal. Only obvious thing that would cause a massive improvement would be hardware upgrade, otherwise that's suspicious.