|ELECTRONIC TOP/SIDE COCKING MODEL #30638 For Spyder E-Markers: Electra, Electra DX, Pilot ACS, Pilot, Imagine, Imagine LED, Imagine Select, Imagine S, Esprit, Fenix, Raven Nexion and other top & side-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 a hardened steel lug and Delrin self-lubricating body.