What is the best assult rifle ever?

That question will be debated for decades to come, further compounded by afficiandos of each weapons platform (who typically have no actual operational experience with them) claiming their favourite to be the best one. AK fanboys are particularly bad for this, completely refusing to acknowledge the weaknesses of those rifles. As for new, state-of-the-art rifles, they lack the most important thing to decide their validity - operational usage. The Magpul Masada/Remington ACR and Czech CZ-803 are certainly among the most advanced assault rifle platforms out there, but have yet to be actually put to the test.