Madbull have sent over details of their PEQ top rail:
This rail ties the upper receiver to the forearm to create a very rigid shooting platform. This rail will also give you the SPR look. Uninterrupted upper rail platform for multiple accessory arrangements. T6061 CNC Aluminum construction
Features:
– Provides a rigid shooting platform
– Functions as a rail riser for scopes or red dot sights
– Gives your rifle a unique SPR look
– Uninterrupted upper rail platform
– T6061 Aluminum CNCPackage include:
– PRI PEQ Top Rail
– Mounting hardwareMore Info and Photo: http://madbull.com/peqtoprail
(Madbull)