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Posted: 9/17/2004 9:54:54 PM EST
For you folks out there with LMT 16" m4 cut barrels, does yours have the "MP" stamp?

Mine is marked:
5.56 NATO 1/7 CB

What does the "CB" stand for, if anything at all?

Thanks in advance,
Jim
Link Posted: 9/18/2004 3:48:33 AM EST
chrome bore I think but dont quote me on that
Link Posted: 9/18/2004 6:05:50 AM EST
CB does indeed stand for chrome bore. I emailed LMT a couple months ago about the MP testing and I received a reply stating that LMT does MP test each barrel.
Link Posted: 9/18/2004 11:33:13 AM EST
Hey, thanks guys.

I appreciate it!
Link Posted: 9/23/2004 5:22:22 PM EST
Does LMT make 1/9 twist barrels? I have one that is supposed to be an LMT barrel however it is marked:
"5.56 NATO 1/9"
Did I get some no-name barrel thinking it's an LMT!?

Link Posted: 9/23/2004 5:31:46 PM EST

Originally Posted By PRKsux:
Does LMT make 1/9 twist barrels? I have one that is supposed to be an LMT barrel however it is marked:
"5.56 NATO 1/9"
Did I get some no-name barrel thinking it's an LMT!?




I don't think LMT makes 1:9 barrels. I believe DPMS uses markings similar to yours, but I'm no expert here. Is it chrome-lined?
Link Posted: 9/23/2004 6:18:09 PM EST
Yep, it's chrome lined and has a "7" stamped into the barrel extension...Are there any numbers on LMT barrels that differentiate them from others? There are some numbers on the FSB:
"1AI2" and then a tiny "L". I know I definitely have an LMT upper receiver since it has the LMT mark on it but I'm wondering about the barrel now...
Link Posted: 9/23/2004 6:32:11 PM EST

Originally Posted By PRKsux:
Yep, it's chrome lined and has a "7" stamped into the barrel extension...Are there any numbers on LMT barrels that differentiate them from others? There are some numbers on the FSB:
"1AI2" and then a tiny "L". I know I definitely have an LMT upper receiver since it has the LMT mark on it but I'm wondering about the barrel now...



Very interesting. I wonder what the "7" means. On a Colt gun, a "4" on the extension means M4 extension. Perhaps LMT does make 1:9 twist barrels, but the marking doesn't correspond to the markings they put on their 1:7 barrels. Did you buy the upper from an individual?
Link Posted: 9/23/2004 6:43:15 PM EST
I purchased it from a company several months ago and put it into storage shortly after receiving it (in the midst of a relocation). I am just now breaking it out for assembly and realize maybe I should have looked it over more than I did...Maybe it's an early production LMT?
Link Posted: 9/23/2004 6:48:18 PM EST
Try contacting LMT...

www.lewismachine.biz/

I emailed them with a barrel question and got a reply.
Link Posted: 9/23/2004 7:01:15 PM EST
Mail away, thanks for the suggestion.
Link Posted: 9/24/2004 8:11:34 PM EST
Got a reply from LMT this morning - thumbs up to LMT's customer service!

Evidently, according to the markings, I do have an LMT barrel. What I thought was a "7" stamped into the barrel extension is actually an "L". So, LMT does make 1/9 barrels...
Link Posted: 9/30/2004 11:28:51 AM EST
Here's a little update.

Take this with a grain of salt, as it's all hearsay from me.

According to LMT (have to take their word for it), they proof load test and magnetic particle inspect the following:

1) barrels
2) bolts

-Jim
Link Posted: 9/30/2004 11:44:18 AM EST
LMT has made some runs of 16" 1/9 M4 uppers. No chrome.
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