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8/10/2015 3:50:31 AM EDT
I was paying through Armslist checking out prices on SP-1's and I came across an ad for a "pre-ban" 1980 SP1.  It said that the barrel was stamped "C P 5.56 Chrome Lined".  Did SP-1's have 5.56 stamped barrels? I had an SP-1 several years ago, unfortunately it was stolen, but I am almost positive it wasn't stamped 5.56 anywhere.  Maybe they did it on later models?
8/10/2015 4:14:33 AM EDT
[#1]
Quoted:
I was paying through Armslist checking out prices on SP-1's and I came across an ad for a "pre-ban" 1980 SP1.  It said that the barrel was stamped "C P 5.56 Chrome Lined".  Did SP-1's have 5.56 stamped barrels? I had an SP-1 several years ago, unfortunately it was stolen, but I am almost positive it wasn't stamped 5.56 anywhere.  Maybe they did it on later models?
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the latest SP1 barrels were marked C MP CHROME BORE for both the rifle and carbine.  Colt did mark post SP1 barrels w/ 5.56.  I think that started with the twist change after 1:12.  i also don't think they marked the barrel with the word chrome after the SP1 timeframe either.
8/10/2015 11:01:50 AM EDT
[#2]
My SP1 (1978 carbine) is marked "C MP B" on the barrel. There is no caliber designation.
8/10/2015 6:15:27 PM EDT
[#3]
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Quoted:


the latest SP1 barrels were marked C MP CHROME BORE for both the rifle and carbine.  Colt did mark post SP1 barrels w/ 5.56.  I think that started with the twist change after 1:12.  i also don't think they marked the barrel with the word chrome after the SP1 timeframe either.
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Quoted:
Quoted:
I was paying through Armslist checking out prices on SP-1's and I came across an ad for a "pre-ban" 1980 SP1.  It said that the barrel was stamped "C P 5.56 Chrome Lined".  Did SP-1's have 5.56 stamped barrels? I had an SP-1 several years ago, unfortunately it was stolen, but I am almost positive it wasn't stamped 5.56 anywhere.  Maybe they did it on later models?


the latest SP1 barrels were marked C MP CHROME BORE for both the rifle and carbine.  Colt did mark post SP1 barrels w/ 5.56.  I think that started with the twist change after 1:12.  i also don't think they marked the barrel with the word chrome after the SP1 timeframe either.


So it's probably a very late model SP1 and the 5.56 stamp is authentic?
8/10/2015 10:47:00 PM EDT
[#4]
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Quoted:


So it's probably a very late model SP1 and the 5.56 stamp is authentic?
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Quoted:
Quoted:
Quoted:
I was paying through Armslist checking out prices on SP-1's and I came across an ad for a "pre-ban" 1980 SP1.  It said that the barrel was stamped "C P 5.56 Chrome Lined".  Did SP-1's have 5.56 stamped barrels? I had an SP-1 several years ago, unfortunately it was stolen, but I am almost positive it wasn't stamped 5.56 anywhere.  Maybe they did it on later models?


the latest SP1 barrels were marked C MP CHROME BORE for both the rifle and carbine.  Colt did mark post SP1 barrels w/ 5.56.  I think that started with the twist change after 1:12.  i also don't think they marked the barrel with the word chrome after the SP1 timeframe either.


So it's probably a very late model SP1 and the 5.56 stamp is authentic?


No, the last SP1s showed " C MP CHROME BORE."  I've never heard of a barrel marked "C P 5.56 Chrome Lined."  Can you get pics?
Can you find out what the twist is?
8/10/2015 10:50:42 PM EDT
[#5]
Quote History
Quoted:


No, the last SP1s showed " C MP CHROME BORE."  I've never heard of a barrel marked "C P 5.56 Chrome Lined."  Can you get pics?
Can you find out what the twist is?
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Quoted:
Quoted:
Quoted:
Quoted:
I was paying through Armslist checking out prices on SP-1's and I came across an ad for a "pre-ban" 1980 SP1.  It said that the barrel was stamped "C P 5.56 Chrome Lined".  Did SP-1's have 5.56 stamped barrels? I had an SP-1 several years ago, unfortunately it was stolen, but I am almost positive it wasn't stamped 5.56 anywhere.  Maybe they did it on later models?


the latest SP1 barrels were marked C MP CHROME BORE for both the rifle and carbine.  Colt did mark post SP1 barrels w/ 5.56.  I think that started with the twist change after 1:12.  i also don't think they marked the barrel with the word chrome after the SP1 timeframe either.


So it's probably a very late model SP1 and the 5.56 stamp is authentic?


No, the last SP1s showed " C MP CHROME BORE."  I've never heard of a barrel marked "C P 5.56 Chrome Lined."  Can you get pics?
Can you find out what the twist is?


i don't think Colt has ever used "Chrome Lined" on their barrels.
8/11/2015 4:47:09 PM EDT
[#6]
Quote History
Quoted:


No, the last SP1s showed " C MP CHROME BORE."  I've never heard of a barrel marked "C P 5.56 Chrome Lined."  Can you get pics?
Can you find out what the twist is?
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Quoted:
Quoted:
Quoted:
Quoted:
I was paying through Armslist checking out prices on SP-1's and I came across an ad for a "pre-ban" 1980 SP1.  It said that the barrel was stamped "C P 5.56 Chrome Lined".  Did SP-1's have 5.56 stamped barrels? I had an SP-1 several years ago, unfortunately it was stolen, but I am almost positive it wasn't stamped 5.56 anywhere.  Maybe they did it on later models?


the latest SP1 barrels were marked C MP CHROME BORE for both the rifle and carbine.  Colt did mark post SP1 barrels w/ 5.56.  I think that started with the twist change after 1:12.  i also don't think they marked the barrel with the word chrome after the SP1 timeframe either.


So it's probably a very late model SP1 and the 5.56 stamp is authentic?


No, the last SP1s showed " C MP CHROME BORE."  I've never heard of a barrel marked "C P 5.56 Chrome Lined."  Can you get pics?
Can you find out what the twist is?


The only pic they posted didn't show any detail at all.  Just seemed odd to me which is why I came to y'all.  Anyone know what year they started stamping "5.56" on the barrels?
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