The one stat of the reflex sights is not hidden, it's the 'range' in the stats window.
And that brings up one of the balance issues in the BSM mod, that you can plug the desert sights with 200m range from the shop for cheap and it is better than all the others, giving the communist weapons a handicap.
Not quite sure, but realistically the communists should have a higher sustained rate of fire to make up for that
