BlueShot - The Chronograph Connection. Want to really understand the performance of your Firearm, Ammunition, Air Gun? Now works with Combro and Shooting Chrony Chronos. The BlueShot app and BlueShot Interface make getting shot data from your Combro or Shooting Chrony Chrono easy. Get the free BlueShot app from Google Play and order your BlueShot Interface for just £29.