The rail itself is exactly as expected, the anodizing and paint is more than good enough. The barrel nut however is too shallow for VFC which leaves a gap, same happens on the Guns Modify rifles.
For the GM rifles you can 3dprint a shim to place inbetween the nut and the rail to remove the problem.
Hopefully newer models will have an improved barrel nut and old customers get a replacement, that would make it a 5star for me.