E&C M4 with M203Features: Full metal construction Sliding Crane stock Metal M203 Grenade Launcher mounted onto barrel Detachable carry handle allows for mounting of most optics with a 20mm mount Adjustable front and rear sight Locking mock bolt allows for easy hop up adjustment Functioning M203 launcher works with most 40mm Airsoft grenades Full metal barrel assembly Metal Ver. 2 quick change spring gearbox is easily upgradeable Length: 1000mm Weight: 8. 25 lbs Inner