Well my new RD M4 is ready to ship and just so happens that they have some pics up on the Rifle Dynamics website.
This rifle has the Fail Zero complete Nickel Boran coated upper, BCG,Bolt,Charging handle and hammer.
Knight URX rifle length rail over a carbine gas system which will completely protect the gas block and tube. The Knight rail system eliminates the need for a slip ring and barrel nut as the rail system actually screws into the upper receiver. This gives you a complete uninterupted monolithic top rail. It also has a built in front sight eliminating the need for an added front sight. This system allows the barrel to be completely free floated aiding in accuracy and cooling.
The nickel boron allows the gun to run without lube or cleaning if you needed to for some reason. One such rifle was run without lube or cleaning firing over 5000 rounds of Wolf ammo without malfunction.
It is done in tan moly to match the AK I had built earlier.
I will top both the M4 and AK with Aimpoint H-1 micro red dots for the moment. Now I just have to get home to shoot them.