The shift from AK to AR is a sign they are becoming professionals.
Poland still uses a design based on the AK, and they are professional.
I suspect any improvement in shooting when they switch from AK to AR will because of the US issued optics or commercial-off-the-shelf optics they are mounting on their weapons over there.
The US Military learned that magnified optical gunsights and NVG were huge force multipliers in Iraq and Afghanistan.