That statement is completely void of useful information lol
Since we're recommending aeg's and you want an accurate rifle, I suggest getting something that's mechanically able to BE a marksman platform.
AUG, G3, AK series, M14s especially
Those are all known to have excellent hop chamber designs to give you the best possible accuracy.
Contrary to popular belief, the M4 actually makes a really poor marksman rifle due to it's hopup chamber design. But that doesn't mean you can't still get really good performance out of it