You probably have some connections. Maybe you could score an Hk upper?
. . May look at a entire Hk 416 semi auto variant when the insanity dies down but right now I just want to make a briefcase gun with a SBR tax stamp papered barrel to carry in a 1495 briefcase.
Sort of like the one on this page ...
http://www.ar15.com/forums/t_3_19/591961_SBR_hard_case___.html&page=1&anc=bottom#bottom
Really like the carry configuration etc .... Just not a fan of SBR’s with pig tail gas tubes and or adjustable gas tubes etc .... Used those in the past and they have to be cared for more than usual etc
Just another tool in the toolbox per se....:o)