Rooster2412 Posted April 28, 2021 Report Share Posted April 28, 2021 (edited) Back when Colt products were manufactured "In House". Factory pencil thin 11.5" Colt Commando barrel chambered in 5.56 NATO w/ 1/7 twist. Barrel is marked "C MP CB" on top. Stamped "O" for chrome lining and 08/13 for manufacture date. Upper receiver is shown with the Stamped C for Colt & a Raised Keyhole for Keyhole forge, as well as "M4" stamp on the front face above the gas tube hole. Includes Magpul MBUS rear sight. Bolt carrier is Roll Stamped with a Die showing a distinct "C" instead of "auto signed or etched" like on the newer production and has an "MPC" marked bolt. "F" stamped front sight. This upper receiver was purchased from Colt Defense in 2014, fired (by a close friend) 100 rounds of M855 and put back into a temperature controlled safe. I recently accquired another Colt RO933, a 11.5" DIEMACO COLT CANADA upper from this gentleman. Enhance the photos and look closely. Both of these have very desirable markiings. http://www.sturmgewehr.com/forums/index.php?/topic/20895-colt-canada-diemaco-ro933-115-upper-vintage-0604/ THE CERRO KEYHOLE UPPER IS PRICED $ 1950.00 DELIVERED TO THE LOWER 48 INSURED FOR THE FULL AMOUNT, PRIORITY MAIL W/TRACKING. I ACCEPT DISCREET ZELLE CASHIERS CHECKS & USPS MONEY ORDERS. Edited April 28, 2021 by Rooster2412 Quote Link to comment Share on other sites More sharing options...
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