I'm not fully sure if I understand why the G36 was nerfed. Pre-nerf it didn't even boast that much damage and had the second highest recoil of any of the other ARs.
For starters the UMP-40 is free and does 21 damage to the head, 15 to the torso and 11 to the limbs with the the exact same fire-rate as the G36 but with lower recoil. This makes it statistically and economically better than the G36 due to the fact that it is completely free.
The Current G36 does 12 damage to the head, 11 to the torso and 10 to the limbs. The G36 also has higher bulletspread and higher recoil. This makes is statistically and economically worse than the Free UMP-40 as it does essentially less damage for 27500 cash.
The Blastgun is the cheapest of the ARs at only 17500 cash to purchase. This gun also has the fastest fire rate of any of the guns listed. That being said it does more damage than the G36 which doesn't make sense due to the fact that that its almost twice as cheap and shoots faster meaning that it will have a lower time to kill than the G36.
Currently the carbine remains un-nerfed even though it has higher damage, costs less, has less bullet spread, and incredibly low recoil and a moderate fire rate compared to that of the G36 which makes no sense. 
Does nerfing the G36 balance the game? That's in question. But just taking a 3 minute look to analyse any of the other ARs in the game will let you know statistically that the balancing of the G36 doesn't really make that much sense.
G36 will be reverted to its old state in future updates. Additionally all weapon damages may be reviewed
Reasons for why to keep it nerfed:
People abuse no recoil, such as Gardener and HypNez
It had very high damage and fast fire rate so obviously people would use cheats to abuse that weapon
Axiira begs for it to be strengthened and buffed, because he is just like Gardener
^ the actual story - cant deceive me