The latest entrant in the MOSFET area in airsoft. This Burst Avodado Regulator Device is available at Airsoft Buddy for US$36.00. You're not only limited to a 3-round burst as you can set how many BBs can be fired. No need to solder the MOSFET as you can install it within seconds... "No more patent for PTW's Three Burst! All AEGs can do the same!