External :Full metal14mm CCW Flash HiderAluminum front and rear sightsKey-Mod 6" handguard with picatinny railInternal :Reinforced AK type V3 gearbox with steel gear and 7mm bearingsMetal spring guide and on bearingPolymer piston and metal teeth, type 1 cylinderV3 AK internal parts (nozzle, trigger, tappet plate, selector plate)