If you want to install the new ak47 model for css v34 (and v84+) on your client, download Ravaged AK47. By the way, the skin was developed based on this Kalash.
I also want to draw your attention to the fact that the presented model has a slight resemblance to the Kalashnikov from cs go, since they have identical sounds, and reload animations are quite similar. The differences are visible only in appearance and how the player holds the gun.
Due to the fact that I personally tested the performance of the Ravaged AK47 skin on different versions of counter strike source, I can safely say that it will not spoil your game with lags, but on the contrary, it will add a little realism and variety.