Here is a neat piece of M16 history up for auction. Thanks to Alex over at the AR15 resource facebook page I can bring this to your attention in case you want to place a bid.
Description: This is an exceptionally rare piece of Colt history, with less than 20 having been made. Colt developed these rifles during their experimentation with the new CAR-15 system, during which they focused on seven different versions. Ultimately, the HBAR M2 was discarded, but before production was discontinued, less than twenty were produced. This gun is pictured on pages 175 and 176 of “The Black Rifle” by Stevens Ezell, and close examination of both the photos and the gun confirms that this is the actual item pictured in the book, despite not being listed by serial number. This example has the early second type three prong flash suppressor, heavy barrel, modified M2 bipod, fitted with one of the early round interchangeable handguards from Colt’s first offering, carryhandle sights, early A1 style pistol grip, and buttstock with rotatable sling swivel and cupped rubber buttplate. Colt then added a very clever belt feed mechanism, that sits in the magazine well when the rifle is opened and locks in when the rifle is closed. The vertical actuator attaches to a special cut in the bolt carrier group to actuate, and a slot was added on the right side, where a feed chute would feed spent links into a separate compartment of the feed box. This rifle is accompanied by three drum magazines and a link of 25 dummy cartridges. One drum magazine has the removable top attaching section, other two do not have this piece and are filled with links. There is also an additional pin equipped with a pull ring. CONDITION: Very fine overall, retaining the vast majority of its finish with some markings from usage. Bolt face is excellent, bore is excellent, mechanics are crisp. As to be expected of an early experimental gun, some of the work is a little crude, but still well executed. This lot is also accompanied by a copy of “The Black Rifle” by Stevens and Ezell, as well as a printout of the Bob Miller Estate sale, where this gun was number 32. PROVENANCE: Bob Miller Estate. If you are a collector of rare firearms, belt fed machine guns, or even Colts, this is a collector’s prize. THIS IS A NATIONAL FIREARMS ACT ITEM AND REQUIRES BATF APPROVAL PRIOR TO TRANSFER. THIS ITEM IS FULLY TRANSFERABLE ON AN ATF FORM 3 OR FORM 4. EWAccessories: Ammo links, three total magazinesBarrel Length: 21 – 3/4″Caliber/Bore: 5.56mm NATOFFL Status: NFAManufacturer: Colt FireamsModel: AR-15Paperwork: Copy of “The Black Rifle” and a copy of Bob Miller Estate sale paperwork.Serial Number: 018954
You can bid on it now if you have thousands of dollars burning a hole in your wallet.