Lancer Tactical Airsoft Rifle Gun M933 330 - 350 FPS Commando Proline Airsoft AEG - TANFeatures: Built in Lancer Fast Trigger with MOSFET to regulate electric flow and protect trigger contacts Full metal upper lower receivers, one piece outer barrel, CNC buffer tube Quick change spring system for rapidly adjusting muzzle velocity Low resistance wiring prevents potential damage from the battery Enhanced trigger guard and motor pistol grip with positive texturing for improved handling Ball bearing spring guide withstands higher stress