The Gold Spring (GS) is designed for use in the Patriot, AT50, Hare - RBT and T/C units and RTC. When installed, the trap can launch a target up to 70 yards. For AT 50 and Patriot units it replaces the Gray Spring. For Patriot units, the spring must hook in from the left side when standing at the back of the unit, with the opening facing right.