Find out more about the mock silencer units from G&G Armament such as the MIT and Chrono Unit in this video from Evike.com... "The G&G Military Intelligence 14mm CCW Tracer Unit is a very clever gadget that will allow you to chrono your gun, act as a tracer unit lighting up any tracer BBs as well as count how many BBs go through the unit. There is a reset button so you can reset the count at point while in use.