Crosshair used for AK47:
bind n "cl_crosshairstyle 4;cl_crosshaircolor 9;cl_crosshairdot 2;cl_crosshairsize 22;cl_crosshairthickness 0.2;cl_crosshairgap 0;cl_crosshair_drawoutline 1"

Crosshair used for M4A4:
bind m "cl_crosshairstyle 4;cl_crosshaircolor 9;cl_crosshairdot 2;cl_crosshairsize 16;cl_crosshairthickness 0.2;cl_crosshairgap 0;cl_crosshair_drawoutline 1"

Orginaly cl_crosshairsize was 20 and 14 respectively

DPI:400 or 350
Sensitivity: 2.0
Resolution: 1024 x 768 4:3 stretched