The is one of the highest-rated AEGs we've EVER carried here for good reason. It is the quintessential "Player's AEG" - it comes with everything you need and nothing you don't. For the all-new enhanced production run model, JG has done the impossible. They've re-worked and improved what MANY players thought was already a PERFECT AEG. So this new model comes to you straight from the manufacturer having been re-designed from the ground up to be even more powerful, more accurate, more versatile, more reliable, and yet STILL be one of the most affordable high performance AEGs on the planet. The M4 S-System comes equipped with a full metal integrated RIS system has a top sight rail extending all the way back to the rear sight, making it one of the most versatile AEGs that JG manufactures. Topping the chronograph at over 400+ FPS, the M4 S-System has a muzzle velocity that overpowers the likes of $300-$450 Tokyo Marui and Classic Army AEGs. Its JG enhanced full metal gearbox & super high-torque motor set-up has been thoroughly designed to ensure that no matter WHERE you play. With full Tokyo Marui parts compatibility and many other aftermarket upgrade parts compatibility, this AEG can be easily customized and upgraded. The rail system further adds onto the upgrade potential of this gun, since you can add an almost endless amount of tactical accessories to it, including flashlights, scopes, lasers, and grenade launchers.