By 1942, in a thorough study of bore erosion of guns large and small (from 3″ naval guns to small arms), Burlew noted a report by Russell that considered chrome plate a “bad” material from a bore-erosion standpoint, except “when made very adherent”; in that case it was an “excellent” material, roughly five to nine times better. Bolt and Bolt Carrier Manufacturer Stampings (Above) Colt carriers have a 'C' stamped to the left of where the firing pin retainer is inserted (Left) Colt bolts are marked 'MPC' on the side between the ejector and extractor pin holes - Image enhanced with red text for illustrative purposes. Bolt Stamping Information Courtesy John M.
Good afternoon. I recently purchased a Colt SP1 (R6000), which based off of the serial number dates to 1975. What concerns me is that the barrel markings read 'MP CHROME BORE'. My understanding and research tells me that there should always be a 'C' marking on Colt rifles. It is common knowledge that Colt just used whatever parts they had available (including Govt. contract parts) and I cannot find any conclusive info on the inter-webs, so I am hoping that some of you Colt experts can set me straight on the matter. Somewhere I was reading that there is sometimes a marking on the barrel between the FSP clamps, but I see nothing there either. My fear is that this rifle was re-barreled at some point or the upper is not Colt. Your expertise is appreciated.
Attachment 48573Attachment 48574
C Mp Chrome Bore Barrel For Sale
Description
USGI M16A1 Barreled Upper Receiver with all GI components…does NOT include bolt carrier group or charging handle. Colt upper receiver with CK or CH forge code. Receiver shows some wear after 40 years. Colt 1/12 twist 20 inch barrel with A1 Birdcage flash hider and either a Colt or BFI front sight base. Barrel marked “C MP CHROME BORE”. Very Good to Excellent bore condition. Handguards are serviceable but will show wear with some gouges and possible broken ears. Buttstock is missing Buttplate, rear swivel, and screws. Includes items pictured.
C Mp Chrome Bore
C Mp Chrome Bore Azzaro
These are from the early 1970s. Perfect for a Retro M16A1 build.