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Posted: 6/23/2012 9:31:35 AM EDT
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I recently acquired a barrel that has the MP by the FH and a 12 under the front of the barrel. It is in good shape by the way.
I am thinking that: It probably was for a M-16E1 It was probably in the 1965-1966 era No chrome in the bore but has a chrome chamber. For those of you with more knowledge than myself does that sound about right or am I off base? |
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Could have also been used on an M16 (slickside) of same vintage. Is the FSB smooth and have no drain hole under the front sight post? Sounds like you got a nice early barrel.
ETA: Chrome in the chamber? It should be marked 'C' instead, where the 12 is. Are you sure it's chrome? |
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Could have also been used on an M16 (slickside) of same vintage. Is the FSB smooth and have no drain hole under the front sight post? Sounds like you got a nice early barrel. ETA: Chrome in the chamber? It should be marked 'C' instead, where the 12 is. Are you sure it's chrome? I don't know if it is chrome in the chamber or not. It is hard to tell just by looking at it. That is why I was asking. Is it the C markings (C MP C) that designated chrome in the chamber and then C MP B to designate chrome in the chamber and bore? |
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Could have also been used on an M16 (slickside) of same vintage. Is the FSB smooth and have no drain hole under the front sight post? Sounds like you got a nice early barrel. ETA: Chrome in the chamber? It should be marked 'C' instead, where the 12 is. Are you sure it's chrome? I don't know if it is chrome in the chamber or not. It is hard to tell just by looking at it. That is why I was asking. Is it the C markings (C MP C) that designated chrome in the chamber and then C MP B to designate chrome in the chamber and bore? Yes. Exactly. The early barrels (non-chrome lined) were marked 12 which is the twist rate. Later barrels had no such marking but are same twist. Sounds like you found a nice early barrel. Most barrels used in Vietnam were likely 'C' marked. B marked barrels really wouldn't have been seen until '71 or so at the earliest. |
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Is it the C markings (C MP C) that designated chrome in the chamber and then C MP B to designate chrome in the chamber and bore?
This is correct. The few MP 12's I've had do kinda give off the chrome in the chamber look but they aren't hard chromed just like the shiney barrel bore. Buy a well abused one that wasn't cleaned and you will see the chamber isn't hard chromed. Fast Morg, and OP nice dig. Glad you found one as I know you wanted one pretty bad. I'm kinda wanting a C MP C with the chrome extension for a build I have going but may just use a new Colt M-4 and make a retroish carbine if I can't find one cheap. |
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Is it the C markings (C MP C) that designated chrome in the chamber and then C MP B to designate chrome in the chamber and bore? This is correct. The few MP 12's I've had do kinda give off the chrome in the chamber look but they aren't hard chromed just like the shiney barrel bore. Buy a well abused one that wasn't cleaned and you will see the chamber isn't hard chromed. Fast Morg, and OP nice dig. Glad you found one as I know you wanted one pretty bad. I'm kinda wanting a C MP C with the chrome extension for a build I have going but may just use a new Colt M-4 and make a retroish carbine if I can't find one cheap. My understanding was that the progression of the barrels were: 14 marked - no chrome - early 601s 12 marked - chrome chamber?? - up until about 1970 C MP C - chamber chrome - approx 1970 - 1971 C MP B - chamber and bore chrome - approx 1972 C MP Chrome Bore - chamber and bore chrome - post early 1970s I was not sure if the 12 marked had chrome in the chamber or not. Thanks for clarifying. |
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Is it the C markings (C MP C) that designated chrome in the chamber and then C MP B to designate chrome in the chamber and bore? This is correct. The few MP 12's I've had do kinda give off the chrome in the chamber look but they aren't hard chromed just like the shiney barrel bore. Buy a well abused one that wasn't cleaned and you will see the chamber isn't hard chromed. Fast Morg, and OP nice dig. Glad you found one as I know you wanted one pretty bad. I'm kinda wanting a C MP C with the chrome extension for a build I have going but may just use a new Colt M-4 and make a retroish carbine if I can't find one cheap. My understanding was that the progression of the barrels were: 14 marked - no chrome - early 601s MP (FSB) and 12 marked - NO chrome chamber?? - up until about 1970 MP (FSB) and C - Chrome Chamber C MP C - chamber chrome - approx 1970 - 1971 C MP B - chamber and bore chrome - approx 1972 C MP Chrome Bore - chamber and bore chrome - post early 1970s I was not sure if the 12 marked had chrome in the chamber or not. Thanks for clarifying. Correction in markings made in red. the dates are not right though, HERE is a copy and paste from EKIE in the variations guide at the top of the forum.  THis is just for the 604 and m16a1 and xm16e1, etc.
-A "12" marking was added just over and inch from the muzzle to differentiate it from the earlier barrels. Marking was used from 1963 till the Fall of 1967: -In 1964 Colt’s began marking a M next to the VP marking meaning the barrel had been magnetic particle testing after proof firing to find potential flaws in the barrel: -By 1966 barrels were proof marked in the same spot as before, but the proof symbol was changed to a P, so they now simply read MP, with the M & P run together. This MP marking was moved by 1969. -Starting in October 1967 and prior to serial number 800,000 Colt’s added chrome to the chamber. Chrome chamber barrels are identified by a C about an inch back from the muzzle rather then the earlier 12: -Rather then being marked on the right side some H&R barrels were marked with an unside down MP on the left side. These barrels had chrome chamber, so they also had the C mark near the muzzle: -Chrome chamber barrels were also plated in the barrel extension: -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. This marking was used as late as 1970 or 1971 and serial number 4,552,XXX. The C means Colt’s, the M means Magnetic particle inspected, the P for Proof fired, and the C near the muzzle for Chrome chamber. (late C MP C pic provided by yfs200): -Some 1969 CMPC barrels had chrome all the way out onto the locking lugs and part of the feed ramps. 1969 CMPC barrel on right, chrome chamber and bore barrel on left: -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: ––Starting in 1974 and after serial number 4,900,000 chrome bores were marked C MP CHROME BORE. This marking was used all the way until the end of M16A1 production: AH, HECK JUST CLICK HERE 
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if too found one of those barrels would it work on a 604 build? http://i321.photobucket.com/albums/nn366/zookyman/SDC10817.jpghttp://i321.photobucket.com/albums/nn366/zookyman/SDC10819.jpghttp://i321.photobucket.com/albums/nn366/zookyman/SDC10818.jpg It'd be correct for an early 604. |
| Hkiller looks good. Is the finish on that kinda greenish parkerized or just the pic. Most I've seen were more grey but I like the greenish parkerized AR pieces probably the most and as stated probably the preferred barrel for an early 604 clone. VP would need to go on an 01 or 02 clone or sold to someone who needed it for their build. |
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