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For M4/AR-15. Slim profile, compact rail system with extended top rail to allow mounting of optics and accessories. Top rail is in line with the upper receiver rail and extends back over the delta ring, allowing mounting across the entire top of weapon. Firmly locks to the barrel nut so mounted optics retain zero. Drop-in installation. CNC machined, hardcoated black anodized aviation-grade 6061 T6 aluminum construction.