Mine says C MP Chrome Bore I assume it is a Colt 1/12 GI barrel? If it is in a Colt upper and is not marked with the twist ratio, it might be. Could also depend on the length. 20" = 14:1 while the 16" could be a 12:1. Have to go along with most of what has been already said in the the C did not stand for chromed barrel.


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Possible years of production on this assembly are between 1972 and 1974. These receiver assemblies have the Colt proof marks on the front right side of the receiver. Chrome lined bore is dirty and shows wear. Colt .223/.556 C MP Chrome Bore Competition Barrel. Look at photo's and you decide the condition, this came off an operational firearm. As you well know these don't come up for sale hardly at all and Colt has been out of Stock it seems forever, so now's your chance to have a back up or finish off your prodject High condition Colt M16 machine gun with C MP marked chrome bore.

C mp chrome bore barrel

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I have another Colt M16 barrel that has only the chamber chromed; Effective in December 1971 at about serial number 4,700,000 along with the chamber the bores were chromed, early ones were marked C MP B. The C means Colt’s, the M means Magnetic particle inspected, the P for Proof fired, and the B for chrome Bore. The barrel extention on these not chromed: MP Magnetic Particle Tested C Chromed Chamber CB Chromed Bore HBAR HBAR Barrel Profile CL= Chomred line(RRA) CM=Chrome Moly(RRA) Barrel Stamping Methodology Manufacturer Quality Control Caliber Barrel Twist MISC Examples C MP CHROME BORE Colt Magnafluxed with a chrome lined bore C MP 5.56 NATO 1/9 HBAR Colt Magnafluxed, in 5.56 NATO, 1 in 9 Roll Mark on 1:7 barrel: “C”: Colt. “MP”: Magnetic Particle Inspected.

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By 1969 and before serial number 1,750,XXX Colt's chrome chamber barrels were marked C MP C, and the proof markings and C were moved to the same spot. Auction:9948397 This is a Colt Upper reciever with barrel marked C MP Chrome Bore.The barrel has been cut down to around 15 inches without the flash hider.The All of the examples that I've seen came with barrels marked as below: C MP 5.56 NATO 1/7 Actually, it's not the only Match Target model with a chrome lined bore and chamber and 1/7 twist.

C mp chrome bore barrel

ZDNet reports Spartan will also support third party extensions a la Firefox and Chrome. (C) Submission titles must adequately sum up your view and include Texas Steakhouse och Cracker Barrel ligger inom ett kvarter fr氓n hotellet. There is not an MP on either side who has not measured his or her 

C mp chrome bore barrel

Looking on other forums I've read that Colt used military barrels in the SP1,  The upper is a brownells/NDS upper, brownells "chrome" bolt carrier group, original colt SP1 1/12 twist barrel and front sight block, fiber opotic ar15 front sight   Results 1 - 25 of 69 Colt Post War 1911 A1 USGI Barrel M-P W/ C In Square Exc. Bore #F844. $129.95. Free shipping. or Best Offer  Items 1 - 24 of 26 The 5.5 contour is a heavy sporter for our "big bore" collection" tapers to .750 at 26". Comply with CMP competition rules and are legal for the 1903 … DPMS PATTERN 308 HYBRID BARREL, RIF 29 Apr 2015 The bore is good, all parts are original and the gun works perfect.

C mp chrome bore barrel

I have an MT6551 that came with the Gov't A2 profile 1/7 chrome barrel, got it NIB. Auction:9948397 This is a Colt Upper reciever with barrel marked C MP Chrome Bore.The barrel has been cut down to around 15 inches without the flash hider.The Late 604 "C MP B" (Colt, magnetic particle, proof fired, chrome bore) marked barrel. These were mated to a slabside receiver with No forward assist or casing deflector.
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C mp chrome bore barrel

It's shiny like a mirror. A chrome lined bore has more of a matte or flat sheen to it and is more of a light silver-gray color.

Chrome bore is in *Very Good* condition. Polymer First Samco M44S picatinny rail handguards are in *Very Good* condition and include rail covers. Colt manufactured upper receiver with A2 type sights and "Burton bump" case deflector.
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Original barrel for the M16 A1 marked “C MP-B” on front of barrel, bottom side. advantage over the 14.5&q 16 Jul 2012 “C MP Chrome Bore”(Chrome Chamber, Barrel & Magnetic Resonance Tested ).

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From 20 caliber to 4 bore Krieger Barrels makes fully custom bolt gun blanks. are service rifle match legal and you can get them in chrome moly or stainless steel Our GI pattern M1 Garands are John C. Garand/CMP Match legal while

Smith & Wesson M&P quad rail handguards in *Good* condition, with moderate wear. NOTE: Prior to installing this length of barrel into a rifle a NFA Form 1 must be completed and returned approved. Colt manufactured barrels have "Chrome Bore" stamped on the top of the barrel. So if it is a Colt AR, yours does not have a chrome bore.