The Caldwell Ballistic Precision Chronograph IR LED Light Kit is made specifically for their own Caldwell Ballistic Precision Chronograph, so some modification may be requires to be used with other products like my Chrony Chronograph for instance! Read full article here: https://www.replicaairguns.com/2016/9/2/caldwell-ballistic-precision-chronograph-ir-led-light-kit-pr.html