We have the 4R in M16A4 configuration in production now.
These will be the only 4R configuration available for Spring 2012. We did the Govt Profile, taper to .625" under the hand guards last spring and the DMR profile, .80 under the HG, last fall. Both reportedly shoot very well.
We seem to have 50/50 demand between the two with military/le shooters. There is a debate to be had?