The TRM3 Triple Rail Mounting System for AR15/M4/M16 rifles combines to provide all three rails on lower hand guards for gripping ease. It provides thumb access to light, and laser mounting to side rails. This versatile Triple Rail Mounting System is designed with reinforced Polymer material to ensure the rail will remain secure under all operating conditions. Features Include: Provides easy tactical light operation while using a vertical grip and light mount, Triple Rail Mounting System can be used separately instead of a combination rail, Equipped with two 45 rails that will not interfere with iron sights, Mounts onto upper and lower vent holes of most existing handguards, Constructed of high density Polymer. Sell Unit Each.