Amazon offers free shipping on the NcSTAR MAR4L Full-Length Rifle Handguard AR-15/M16 Quadrail System. NcStar AR-15 Quad Rail System 12 Inches (MAR4L) Specifications 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 …