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Robert, this rifle has a standard 8 inch Polymer Hand Guard. (https://www.armalite.com/product/def10-defensive-sporting-rifle/) (A S&W Quad Rail would work) -- https://www.midwestindustriesinc.com/MI-AR-10-Gen2-Two-Piece-Handguard-Carbine-Length-p/mi-ar10chg2.htm