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Posted: 11/15/2003 1:21:09 PM EDT
[Last Edit: 11/15/2003 1:21:30 PM EDT by billclo]
I picked up a Colt 1/9 twist 16" M4 style barrel back in 1999, and am wondering what markings I should be looking for to confirm that it is chrome lined. I have been reading lately that Colt only chrome lines the chambers and not the barrel, so I wonder whether or not mine is.

Thanks for the help
Link Posted: 11/15/2003 1:52:22 PM EDT
Link Posted: 11/15/2003 3:25:14 PM EDT
Ugh, so no chrome then. That stinks... Hmmm...just the excuse I needed to consider one of the 1/7 16" Bushmaster barrels that were to be custom ordered. :)
Link Posted: 11/16/2003 12:29:33 AM EDT
Take a look at the muzzle, after thoroughly cleaning it, and u should see a little ring of chrome around the bore, if chrome lined. The 16" Hbar 1/9 for the 6721 was chrome lined bore and if that M4 barrel was made from one of those blanks then it would be all chrome lined. On the older Colt barrels the chrome ring at the muzzle was more pronounced. On later barrels it is less so.
Link Posted: 11/16/2003 11:27:31 AM EDT
Colt still makes the 16" M-4 barrels in 1/9 for the model 6922. It's an LE only rifle and they only make them in limited runs. I don't know if the barrel would be availible as a part for the general public, but it never hurts to call and ask.
Link Posted: 11/16/2003 12:16:50 PM EDT
Originally Posted By billclo: Ugh, so no chrome then. That stinks... Hmmm...just the excuse I needed to consider one of the 1/7 16" Bushmaster barrels that were to be custom ordered. :)
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Yes, please do! I know at last count we were up to 9. I have a great project lined up for mine and I don't want to miss this opportunity.
Link Posted: 11/16/2003 6:15:31 PM EDT
I went back and looked at my barrel's markings. It's marked "C MP 1/9 NATO". I was under the impression that the MP meant that it was magnetic particle tested. Does "C" mean Colt or "Chrome"? My Bushmaster barrel says "BM MP 1/9", and I know that it's chromed.
Link Posted: 11/16/2003 7:17:07 PM EDT
My 1x7 Colts are marked C MP and they definitely have a chrome bore. I recently sold a Colt 1x9 HBAR also marked C MP and that too was chromed. Only way to tell is to look at the muzzle end.
Link Posted: 11/17/2003 7:25:56 AM EDT
Originally Posted By billclo: I went back and looked at my barrel's markings. It's marked "C MP 1/9 NATO". I was under the impression that the MP meant that it was magnetic particle tested. Does "C" mean Colt or "Chrome"? My Bushmaster barrel says "BM MP 1/9", and I know that it's chromed.
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The "C" means Colt, not chrome.
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