Default settings in CS 1.6 are often outdated for modern hardware. High-refresh-rate monitors and high-DPI mice require specific commands to eliminate "skipping" and ensure your crosshair stays glued to the enemy's head. A "New Aim CFG" focuses on three pillars:

The Ultimate CS 1.6 CFG Aim New Guide: Master Your Precision

Removing acceleration for 1:1 muscle memory.

To hit headshots consistently, your mouse must behave the same way every time. m_rawinput 1 (If using the Steam version). m_filter 0 (Removes mouse smoothing).