Japan airsoft retail chain, FIRST, shows us the features of the Lancer Tactical Gen 3 M-Lok AEG which is available in several variants at their store...  "Lancer Tactical's latest model, Generation 3 electric gun. High-strength full polymer AEG structure boasts high durability while being lightweight. Equipped with metal Gen-2 gearbox, 18:1 steel gearset, steel piston and 19000RPM high torque motor.

It has a built-in Zion Arms electronic trigger unit that can shoot in a variety of burst modes."