This MAX-9 Standard Slide Assembly with ReadyDot(TM) Sight allows for installation of micro red dot optics on MAX-9 pistols equipped with a loaded chamber indicator (model 3518). This accessory replaces the pistol's loaded chamber indicator-equipped slide with an optic ready, direct mount slide for co-witnessed JPoint(TM) and Shield-pattern micro red dot sights. This Slide Assembly comes equipped with a ReadyDot(TM) micro reflex light-gathering fiber optic red dot sight already installed. It also comes turnkey with all sights, barrel, extractor and other slide components to simplify installation using the included installation instructions. Read the included instructions and warnings carefully before installing and using this slide assembly.Recoil Spring is NOT included.