Here at NcSTAR, We are continuously expanding our line of AR-15 Accessories. The request for an NcSTAR multi-rail handguard set has been so overwhelming that we couldn’t hold back any longer. Introducing the AR-15 Quad Rail System. This 4 Rail Handguard System is designed to replace your standard AR-15 handguards installing in minutes with NO gunsmithing or modifications required. The Quad Rail System is constructed of Hard Anodized Aluminum to prevent corrosion for lasting durability. Choose from Carbine Length MAR4S (6.5 inches) or Rifle Length MAR4L (12 inches).