Customer Reviews
The first thing I noticed was that the spring was Ā¾" longer than the stock spring. I installed it and it chronographed at over 180 FPS. The only way I could get it down to the advertised FPS was to gradually cut off 1Ā¾ of the spring. I don't know what happened between the initial testing by Out of Darts and shipping but I did not get what I was expecting. It will do what the description says but only by removing enough of the spring to take off all pre-compression.
Hi Eric,
Thanks for your review! We use a 20-shot average to get the numbers listed for any of our products. Our chronograph is a Caldwell G2 with a dedicated lighting kit. We use this in a 'dark tunnel' to completely eliminate any other lighting outside of the dedicated lighting on the unit. We also use fresh Worker HE standardweight darts.
In our testing of a dozen different chronographs, we've found this to be the most reliable chronograph. Your milleage may vary, as each chronograph can yield different results. Chronograph readings can also be affected by temperature, humidty, dart age
XYL KM9 Unicorn 1.7 Upgrade Spring
XYL KM9 Unicorn 1.7 Upgrade Spring