This quality M5 Quad Rail Adapter System (RAS) is manufactured by none other than Knights Armament. Easy installation for the top and bottom rails. The KAC M5 RAS rail system was used by the US Military in the M16A4 rifle. Proven in the field this rail system is great for the AR-15 enthusiast and for building correct civilian M16A4 rifle clones. from Venture Surplus (Product 1248PO)

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