Been From the board for quite a while due to marriage, property renovations and an old car resto, but I am now having back into firearms and particularly the AR15 form. So I guess that makes me an old semi FNG. Yes, I'm absolutely sure the upper receiver is Colt, https://colt-combat-elite-command56664.wikicarrier.com/259090/the_colt_python_6_for_sale_diaries