The APS Evolution Tech 10" Airsoft M4 / M16 AEG KeyMod RIS Handguard makes a truly effective rifle accessory integration system for airsoft players. This 10-inch KeyMod handguard is a complete set, which includes three 20mm side rails, a barrel locking set, and KeyMod slug mount. The KeyMod system, which was designed by former VLTOR Weapon Systems research director Eric Kincel, gives a modular mounting surface for the attachment of 20mm rail segments. This allows you to attach rail segments where you want. This also makes the handguard more ergonomic and prevents â€œrail bite,â€ allowing for better weapons manipulation. This free-float APS KeyMod handguard improves the overall durability of the rifle since the handguard never touches the barrel. It also reduces the effect of vibrations/recoil on both real steel and airsoft rifles alike. Made from quality CNC-machined metal, the APS 10" KeyMod RIS is a perfect airsoft upgrade part designed to attach to most M4 / M16 AEGs quickly and easily.