Definitely a no-recoil hack.

Two main reasons:

1) Your cross-hair does not climb upwards as you empty your clip.
2) Your cross-hair does not expand when you fire over an extended period of time.

You have been caught.

Oh by the way, look at the attached demo of an AK. Notice the crosshair climbing even though I am trying to compensate and especially notice that the crosshair expands as I fire through a whole clip...

Go find another server.

I suggest that zero submit this to Steam Bans.