We now carry two versions of the Magnum Spring, an "Economy Magnum" and "Deluxe Magnum". Improvements have been made to last years model and both springs are vastly superior. This spring preforms awesome on coyotes, especially when used with a properly made Lightning Lock. As well reports from numerous wolf trappers are coming that they are very pleased with this products performance on wolves! Be certain to position your triggers sideways on this spring, and clip to the "wire end side" of the spring. This will cause the spring loop or eyelet to flex, and will aid the device in positive firing.