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Posted: 9/3/2004 6:06:33 PM EST
Thanks!
Link Posted: 9/3/2004 6:15:40 PM EST
[Last Edit: 9/3/2004 6:16:11 PM EST by Bradd_D]
It can be kind of tough, but there should be a little flaring of chrome near the muzzle. Don't be fooled if the chamber is chromed, though, as Colt did have barrels with chromed chambers, but not bores. What markings are on your barrel? What type of barrel is it? What is the date code just inside the handguard retainer?
Link Posted: 9/3/2004 6:42:09 PM EST

Should say on the barrel, in some form or fashion.
Link Posted: 9/3/2004 6:47:39 PM EST

Originally Posted By BeetleBailey:
Should say on the barrel, in some form or fashion.



Not necessarily. Older barrels used to say C or CB, but now they say nothing.
Link Posted: 9/3/2004 6:58:23 PM EST
[Last Edit: 9/3/2004 7:04:00 PM EST by MouseBoy]
Just says the typical 5.56 NATO 1/9 C MP. Im confused . These are LE6920, LE6721, LE6530 and LE6450 uppers
Link Posted: 9/3/2004 7:01:12 PM EST
[Last Edit: 9/3/2004 7:02:54 PM EST by Bradd_D]

Originally Posted By MouseBoy:
Just says the typical 5.56 NATO 1/9 c mb. Im confused . These are LE6920, LE6721, LE6530 and LE6450 uppers



Given that they are LE uppers, more than likely they are chrome-lined.
Link Posted: 9/3/2004 7:02:05 PM EST
Link Posted: 9/3/2004 7:04:52 PM EST

Originally Posted By billclo:
Check this out:

www.biggerhammer.net/ar15/barrelsbolts/



The problem with that site is the fact that Colt doesn't mark their chrome-lined barrels anymore. For the most part with respect to barrels produced after '97 or so, civvy barrels are not chrome-lined and LEO barrels are.
Link Posted: 9/3/2004 7:06:23 PM EST
C MP 5.56 NATO 1/9 without "HBAR" chrome lined? Still confused
Link Posted: 9/3/2004 7:07:51 PM EST
Thanks Brad, the site is very informative, but questions still remained everytime I saw that site
Link Posted: 9/3/2004 7:14:18 PM EST

Originally Posted By MouseBoy:
Thanks Brad, the site is very informative, but questions still remained everytime I saw that site



The info is kind of misleading. I would still say that yours are chrome-lined as they are LEO. Can you get a pic of the muzzle without the FS?
Link Posted: 9/3/2004 7:36:55 PM EST
There should be a gray ring at the back of it.
Link Posted: 9/3/2004 7:39:25 PM EST
Anyone know if these are chrome bore and chamber?
Link Posted: 9/3/2004 7:44:29 PM EST

Originally Posted By 223semiauto:
There should be a gray ring at the back of it.



That only means that the chamber is chrome-lined. The bore may not be.
Link Posted: 9/3/2004 7:45:26 PM EST

Originally Posted By Gloftoe:
Anyone know if these are chrome bore and chamber?



Yep...all Bushmaster barrels with the exception of the DCM barrels are chrome-lined.
Link Posted: 9/3/2004 7:57:44 PM EST
Brad, really appreciate the info, have all LEO barrels been chrome lined?
Link Posted: 9/3/2004 7:59:46 PM EST

Originally Posted By MouseBoy:
Brad, really appreciate the info, have all LEO barrels been chrome lined?



I believe so. At least the ones I've owned have been (6920 and 6721).
Link Posted: 9/4/2004 4:07:38 AM EST
Isn't there a definative way to tell by looking at one -not the stampings, but he bore itself.

Seems I recall someone explaing a unique way to tell--something to do with inspecting the chamber or muzzle -not sure??
Link Posted: 9/4/2004 5:46:08 AM EST

Originally Posted By redfisher:
Isn't there a definative way to tell by looking at one -not the stampings, but he bore itself.

Seems I recall someone explaing a unique way to tell--something to do with inspecting the chamber or muzzle -not sure??



The front of the barrel will have a small ring of chrome plating around the opening. As noted above, the chamber will also have a chrome ring around it, but this is not a definitive test of whether the barrel itself is chromed.

If you see a bright ring around the muzzle, and putting a dab of instant bluing on it so not change the color, the bore is chromed
Link Posted: 9/4/2004 5:47:47 AM EST
6520's (govt carbine, pencil barrel) are chrome lined right?
Link Posted: 9/4/2004 6:39:40 AM EST

Originally Posted By shamayim:

Originally Posted By redfisher:
Isn't there a definative way to tell by looking at one -not the stampings, but he bore itself.

Seems I recall someone explaing a unique way to tell--something to do with inspecting the chamber or muzzle -not sure??



The front of the barrel will have a small ring of chrome plating around the opening. As noted above, the chamber will also have a chrome ring around it, but this is not a definitive test of whether the barrel itself is chromed.

If you see a bright ring around the muzzle, and putting a dab of instant bluing on it so not change the color, the bore is chromed



Bingo!
while maybe not definative, combined with stampings, it should reveal the fact(s)
Link Posted: 9/4/2004 2:29:55 PM EST
Link Posted: 9/5/2004 12:47:38 PM EST
Troy is right on the money- the only way to be sure is to nuke the site from orb...uh sorry look for visual evidence. I have a MT6530 16" lightweight bought brand new from shop with chrome bore and chamber, sear relief in upper, M4 feedramps. Barrel is marked "CMP 5.56 NATO 1/7"
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