Gecko is the name given to the second existing shooting simulator in LA, because this animal has an excellent sense of vision and with the simulator you can have an excellent vision which is crucial for this kind of training.
The Gecko simulator is compatible with guns that are triggered by CO2 with a picatinny accessory rail (hay toma de cera del riel en el video). This rail is very common in small guns like the Pietro Beretta or Zigzawer that can all be used for the Gecko simulator, as the rail is a must.