I found a server that is trying to bring the full CS2 style into Minecraft. It is made to feel like the real thing but you do not need any mods.
It has gameplay with maps and weapons. You can also use skins and there is a ranking system so you can grind and see your progress.
It says it is for Java 1.21.11 and it just opened so it feels fresh.
This server is all about tactical warfare in Minecraft with guns using a custom gun modpack. It runs live events where teamwork and strategy matter a lot and you need fast reflexes to stay alive.
The missions are the main thing here. You can get close quarters battles with intense room fights. There is a disarm the bomb mode where you have to defuse it in time. There is also hostage rescue where your squad has to work together.
They also run secret missions and weird events so it does not feel the same every time. If you like chaos and serious gunfights this place is trying to be that.