A/C Autococker Threaded Barrels Autococker threading, also called A/C threading, is a very common barrel thread among speedball and woodsball paintball guns. It has become a standard for the majority of high end tournament paintball guns. The fine design of the A/C threading allows for a tight fit for a better seal between the barrel and the paintball gun. Be sure to get A/C Autococker threaded barrels for your Planet Eclipse, DYE, Tippman, BT and Empire paintball guns. Compatible Paintball Guns: Egos, Geos, Eteks, Dye Guns, Proto Guns, Mini/Mini GS, Axe, Vanquish, D*Fender, TM-15, TM-7, Shocker RSX, Fusion FX, DP G-series, JT Impulse.