Poland should upgrade to these weapons for their entire military.
Nope mate. The Beryl 5.56mm Assaul Rifle has proven it's a good design, based on the 5.45mm AK-74/Tantal but using modern materials (polymers). The 2004 model uses EOTech holosight and new magazines, also a telescopic butt. I've spoken with soldiers from Iraq and what they mentioned is that US soldiers have lots of problems running M-16s/M4s properly in sandy area whereas AK based designs simply work.