I agree it's better now, but I wouldn't say it's stupid good.
Fire rate is still slow, it's the same as AK. You will in theory lose more fights against AK's with A1-S than you will with M4. A1-S should have slightly higher firerate than AK, but not as fast as A4, but that might make it OP.
Either way, both are viable and frankly it just comes down to preference and playstyle.