Very good overall.
Features most necessary details and can be used fairly well, you won't find a better model, especially not for this price.
However, a few negative aspects do exist (if you are REALLY picky, that is):
-missing magazine well details
-barrel does not have the details needed to make it work like the real life counter part
-bipod has to be separated by yourself if you want to fold it
-picatinny rails are way off scale
Update:
After some slight changes to the barrel and bipod, I put it in a VR game.
The downsides barely matter, the positive aspects are overwhelming for anything but a gun disassembly simulator.