COLT PYTHON 6" FOR SALE - AN OVERVIEW

To be a stick to up query, what's the reciever colour for The existing crop of marketplace A1 uppers floating about? Could it be the typical "colt gray" or can it be far more of a environmentally friendly park?Of course, I'm sure the upper receiver is Colt, along with the BCG.  It is really the barrel that is definitely questionable to me.The orig