The estate of famed Colt Vice Preident John Keosayian has been auctioning several pieces from his Colt collection. Ending tonight (in about 3 hours) is an auction for a a Colt Accurized rifle CR6724 which has serial number 1.
I purchased an Arms Unlimited Colt MK 12 HBAR rifle on 21 SEP 2019 at $1495 from Arms Unlimited. I picked the rifle up today (27 SEP) from my local FFL. I am in the process of gathering additional information on the rifle and will publish more details soon. Here is a photo of the rifle.
I have added a section to the site that discusses the Colt Y-hand guards that were provided to a couple of foreign military customers. There is a brief description of the hand guard history, two down-loadable patent files and 28 photos. You can check it out at this link: https://thecoltar15resource.com/y-foreign-contract-hand-guards/