Being a tactical FPS, it is very important that you aim your enemies precisely. Customizing the crosshair suits best for this purpose. By default, critical ops mod apk comes with many pre-installed crosshairs but if you want more then click here and download all available crosshairs from EpicApks. After downloading zip file, extract it and copy folder 'Critical' from extracted location on device storage > data > com.criticalforceentertainment.CriticalOps.