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Posted: 10/13/2016 6:26:24 PM EDT
[Last Edit: 10/13/2016 6:52:59 PM EDT by TheStinger]
I think I got a reasonable deal on a early barrel. Just trying to see if it fits the marking designations I'm finding.

M or W between the FSB and a C near the muzzle. Smooth FSB

Tnx for the help!

EDIT:
Just got the variation guide to FINALLY load pics. Suppose its not as early as once thought C marked replaces the 12 and was 67 ish and its deffinately a M not a W
Link Posted: 10/13/2016 7:30:47 PM EDT
It has an M between the FSB and a C near the muzzle?
Link Posted: 10/13/2016 7:38:34 PM EDT
Yes
Link Posted: 10/13/2016 7:43:26 PM EDT
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Originally Posted By TheStinger:
Yes
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Pics?

Is it an M alone or the standard MP marking?
Link Posted: 10/13/2016 7:47:36 PM EDT
[Last Edit: 10/13/2016 7:49:54 PM EDT by TheStinger]
Alone M believe it predates the C MP C barrel



Link Posted: 10/13/2016 8:05:04 PM EDT
You need to be looking for a cast FSB.
Link Posted: 10/13/2016 9:11:34 PM EDT
It looks like an MP C barrel with a very weak P
Link Posted: 10/13/2016 9:13:07 PM EDT
I saw a really nice 601 1/14 twist barrel today, complete with cast front sight, but he wanted $1900 for it - ouch.
Link Posted: 10/13/2016 11:21:22 PM EDT
Its not an MP its an M and C at the muzzle 1968 with flash removed on fsb. What I get for jumping when on my phone. But still early barrel for 350 inst bad as long as its not shot out
Link Posted: 10/23/2016 1:21:01 PM EDT
The Original Colt 601 utilized a Winchester manufactured barrel that was 1:14 Twist. The marking was a very small "W" between the FSB rings, right side of barrel. Sometimes the W was stamped sideways at times. Colt did not build barrels in house until the enhanced 1:12 twist barrel came along. There is some fuzzy history around the 601/602 transition, as some believe the last 601's built at Colt utilized the new 1:12 twist. This may be within the last several hundred or one thousand guns.The Cast FSB went away in favor of the forged with the next model. Try not to get hung up on all of the accuracy of stampings on barrels due to the fact that it was inconsistent at best from day to day on the Colt production lines. It is also believed that after Project Agile was over in Vietnam (the first combat testing), the rifles were returned to Colt, and re-fitted with the enhanced 1:12 Twist barrels, and returned to service.
Link Posted: 10/23/2016 1:59:50 PM EDT
[Last Edit: 10/23/2016 2:01:43 PM EDT by M16indiana]
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Originally Posted By machinegunkid:
The Original Colt 601 utilized a Winchester manufactured barrel that was 1:14 Twist. The marking was a very small "W" between the FSB rings, right side of barrel. Sometimes the W was stamped sideways at times. Colt did not build barrels in house until the enhanced 1:12 twist barrel came along. There is some fuzzy history around the 601/602 transition, as some believe the last 601's built at Colt utilized the new 1:12 twist. This may be within the last several hundred or one thousand guns.The Cast FSB went away in favor of the forged with the next model. Try not to get hung up on all of the accuracy of stampings on barrels due to the fact that it was inconsistent at best from day to day on the Colt production lines. It is also believed that after Project Agile was over in Vietnam (the first combat testing), the rifles were returned to Colt, and re-fitted with the enhanced 1:12 Twist barrels, and returned to service.
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What about the 1/14 601 barrels with the VP between the front sight legs? I thought those WERE produced in house by Colt. Also, if you start accepting "replacement" barrels as being "correct" for a particular model, then wouldn't ANY military barrel now be right for ANY build?
Link Posted: 10/23/2016 2:11:37 PM EDT
[Last Edit: 10/23/2016 2:12:11 PM EDT by Kalahnikid]
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Originally Posted By M16indiana:


What about the 1/14 601 barrels with the VP between the front sight legs? I thought those WERE produced in house by Colt. Also, if you start accepting "replacement" barrels as being "correct" for a particular model, then wouldn't ANY military barrel now be right for ANY build?
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Originally Posted By M16indiana:
Originally Posted By machinegunkid:
The Original Colt 601 utilized a Winchester manufactured barrel that was 1:14 Twist. The marking was a very small "W" between the FSB rings, right side of barrel. Sometimes the W was stamped sideways at times. Colt did not build barrels in house until the enhanced 1:12 twist barrel came along. There is some fuzzy history around the 601/602 transition, as some believe the last 601's built at Colt utilized the new 1:12 twist. This may be within the last several hundred or one thousand guns.The Cast FSB went away in favor of the forged with the next model. Try not to get hung up on all of the accuracy of stampings on barrels due to the fact that it was inconsistent at best from day to day on the Colt production lines. It is also believed that after Project Agile was over in Vietnam (the first combat testing), the rifles were returned to Colt, and re-fitted with the enhanced 1:12 Twist barrels, and returned to service.


What about the 1/14 601 barrels with the VP between the front sight legs? I thought those WERE produced in house by Colt. Also, if you start accepting "replacement" barrels as being "correct" for a particular model, then wouldn't ANY military barrel now be right for ANY build?


They were. Check The Black Rifle page 97

Rob Roy recalls that his first job after joining the firm [Colt] in 1961 was to devise and supervise the installation of .22 caliber barrel rifling machinery, as prior to that time Colt's had not possessed the capability to produce rifle-length barrels.


Link Posted: 10/23/2016 3:16:55 PM EDT
[Last Edit: 10/23/2016 3:35:41 PM EDT by hk45shooter]
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Originally Posted By M16indiana:
It looks like an MP C barrel with a very weak P
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I agree with this. ^^^ That P is very light.

The style of M on the OP's barrel is different than the M of a 601 barrel & the same as the MP markings. In the OP's pic you can see the bottom portion of the P sticking out from the M.

From Ekie's guide regarding the FSB machined smooth & drain hole: "the forged front sight base was machined smooth to remove forging flash and used on M16 and XM16E1 rifles, and on the M16A1 for a time. Production started as early as 1964, and was used as late as 1969 and serial number 1,750,XXX. A bottom drain hole for the front sight post assy was added in 1967"

Link Posted: 10/23/2016 3:59:21 PM EDT
Discussion ForumsJump to Quoted PostQuote History
Originally Posted By machinegunkid:
The Original Colt 601 utilized a Winchester manufactured barrel that was 1:14 Twist. The marking was a very small "W" between the FSB rings, right side of barrel. Sometimes the W was stamped sideways at times. Colt did not build barrels in house until the enhanced 1:12 twist barrel came along. There is some fuzzy history around the 601/602 transition, as some believe the last 601's built at Colt utilized the new 1:12 twist. This may be within the last several hundred or one thousand guns.The Cast FSB went away in favor of the forged with the next model. Try not to get hung up on all of the accuracy of stampings on barrels due to the fact that it was inconsistent at best from day to day on the Colt production lines. It is also believed that after Project Agile was over in Vietnam (the first combat testing), the rifles were returned to Colt, and re-fitted with the enhanced 1:12 Twist barrels, and returned to service.
View Quote


A slight correction: During the early 601 production, Colt did not have the equipment to produce the barrels so they contracted that job to Winchester. Before the 1-12, however, Colt got up to speed and started producing their own 1-14 barrels.
You can find original "Model 01" rifles, then, with Winchester-made 1-14, Colt-made 1-14 and Colt-made 1-12 barrels.

The simplest tell if a 1-14 barrel was built by Colt is the "C" stamped on the rim of the barrel extension (pic below), but they are also slightly thicker forward of the front sight.
That section between the FSB and the FH is not "straight," but if you take three measurements (close to FSB, close to FH and half-way between them) and average them, you'll get a "measurement" for a particular barrel.
According to Ekie's guide, the Winchester barrels showed a diameter in that area of "about .565"" and Colt-manufactured barrels ran about "about .575"." Based on the very few samples I've been able to measure, however, I believe the Colt barrels ran as light as .570".



As for markings, 1-14 barrels came with a huge variety of stamps--or with no markings at all. Worse, the presence of a "Colt" mark doesn't absolutely prove Colt manufacture. The pic below is of the barrel on Model 01 #000748. It is a Winchester-manufactured barrel but carries a Colt "verified proof" stamp, which leads me to believe Colt did the proof testing on barrels they received from Winchester.



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