Sons of Liberty delivers one of the rigid upper receivers on the market with the Broadsword-89. These uppers are available in .223 Wylde, 5.56 NATO, and the flat shooting 6mm MAX, and come in a wide assortment of barrel lengths. All Broadsword-89 Uppers feature an extended barrel nut, Drivelock tensioning crossbolts, and a Sons of Liberty 89 series rail. Additionally, the anti-rotation tabs and stainless steel center index dowel allows users to transform almost any lower receiver into a match grade rifle. Features of the Sons of Liberty Broadsword-89 Upper Receiver: Available Calibers: .223 Wylde & 6mm MAX Available with multiple barrel lengths Extended barrel nut Drivelock tensioning crossbolts Sons of Liberty 89 series rail Sons of Liberty Gun Works SOLGW Broadsword 5.56 Billet Upper Receiver (Matches M89 Rail) BROADSWORD-89-UR