Have the following for sale:
New Take-off tri rail from DPMS. Fits on flat-top and has A2 rear sight. Three accessory rails.
From DPMS Website:
A combination of a Tri-Rise riser with a rear A2 adjustable sight assembly. Featuring Picatinny style rails on the top, left and right of the riser. This allows you to attach an optic to the top of the rail to be in coaxial line of sight with the rear sight assembly and also allows you to attach other rail-mounted accessories to the side of the riser.
Shipped...Paypal friendly, IM or Email..Trades considered.