Upgrade your M4 rifle with burst mode capabilities with the help from this high quality MOSFET unit from Lancer Tactical. This MOSFET unit is designed to be used in tandem with the Lancer Tactical Fast Trigger Unit and is not confirmed to work with other trigger units. Using a MOSFET unit provides increased trigger response and prolongs the overall lifespan of trigger contacts, while also giving users the option to program their rifle into either 3 or 5 round burst modes. Airsoft Station always recommends professional installation when making upgrades to your airsoft gun, as to not cause further damage. Open up a whole new world of warfare possibilities and outfit your M4 AEG with this MOSFET from Lancer Tactical.