|ELECTRONIC REAR COCKING MODEL #30639 For Spyder E-Markers: E99, E99 Avant, Flash, Flash w/LCD and other rear cocking Spyder electronic markers from Kingman. The revolutionary ACS (Anit-Chop System) is the world's first true anti-chop bolt. This is a drop-in accessory, which replaces your stock bolt with no modifications needed! Simple and affordable! The ACS bolt delivers the same results as expensive markers with eyes! The ACS Bolt is designed with a precision tensioned spring which recognizes obstructions before crushing paintballs and jamming your marker. Also features an aluminum rear cocking rod, hardened steel lug and Delrin self-lubricating body.