USAirsoft reviews the Lancer Tactical M4 KeyMod Gen 2 AEG part of the LT-19 series that are available right now at Airsoft GI, the latest sponsor of the channel. Airsoft GI describes it as... "Internally, the 2nd generation of these Lancer Tactical come with standard Version 2 gearboxes, so upgrades and modifications are easy to come by.