Maximize your rifles full potential while protecting vital trigger contact points with ths Fast Trigger Unit from Lancer Tactical. This OEM replacement part helps to regulate electrical flow to dramatically increase trigger response and rate of fire. The included MOSFET unit gives users to program their compatible M4 rifle with burst mode capabilities, either 3 or 5 round bursts depending on player preference. Although this trigger unit is designed for Lancer Tactical Gen 2 M4 AEGs, it is also compatible with other M4 style AEGs from brands such as G&G, KWA, Krytac, and more! Open up a whole new world of warfare possibilities and outfit your M4 AEG with the Fast Trigger Unit from Lancer Tactical.