sentences:  Designated R19 (R for Rüstsatz) as a factory designed field conversion/upgrade kit, it allowed the pilot of the Do 217 to shoot at pursuers.Another application was the "Gießkanne" (Watering can), an externally mounted pod with three gun pairs, making a total of six guns and their ammunition.Able to fire at a cyclic rate of 9,000 rounds per minute, this was attached to Junkers Ju 87 or Ju 88 in an underwing mount and used to strafe ground targets.