The DBoys M4 S-System is an advanced concept based off of the original M4 Carbine. This airsoft gun features a fully railed upper receiver with a flush attachment to the rail system handguard. The rail system incorporates a quad rail design that allows attachments such as lasers, flashlights, and grips to be placed where the user will find it most effective. The body is made from high-strength ABS Polymer that is lightweight and impressively durable. The adjustable 3-position LE stock paired with a slanted pistol grip insures a natural feel and helps the user to handle the gun. The flip-up iron sights are adjustable for long range targets and removable for a red-dot sight or optic. Internally, the gun features a full metal gearbox that is reinforced with zinc alloy and a high-torque motor for an increased rate of fire and snappy trigger response. The adjustable hop-up is paired with an extended inner & outer barrel for precision shooting. Overall, the DBoys M4 S-System is a superb choice for a reliable airsoft gun in terms of performance and durability.
almost excellent 
