The 
Tokyo Marui M4 SOPMOD Next Generation Recoil Shock (NGRS)
 is a highly regarded, full-metal electric airsoft rifle known for its realism, performance, and unique recoil and auto-stop features. It is considered a premium airsoft replica that offers an immersive shooting experience. 
 
Key Features and Specifications
The 
M4 SOPMOD NGRS
 features a proprietary system that enhances realism compared to standard AEGs. 
Shoot & Recoil Engine: A mechanical system in the buffer tube creates a noticeable haptic feedback (recoil simulation) with each shot fired, adding to the immersion.
Auto-Stop System: The rifle stops firing automatically when the 82-round magazine is empty, mimicking a real firearm running out of ammunition.
Bolt Release Mechanism: After inserting a new magazine, the user must press the functional bolt release button to resume firing, a highly realistic operational step.
High Quality Construction: The receiver, outer barrel, and buffer tube are constructed of metal, providing a rigid and realistic feel and weight.
Adjustable Stock and Sights: It features a 6-position crane-type stock for length adjustment and adjustable front and rear sights.
RAS Handguard: Equipped with a Rail Adapter System (RAS) handguard with rails on all four sides for mounting accessories like lights, lasers, and foregrips.