S&W Barrels?

[hmbeal]

I have a co-worker who has offered to sell me his barrel from his S&W M&P15 MOE for a very attractive offer. He has said it is a1:8 twist chrome lined 4140 steel carbine barrel assembly with 5r rifling but I cannot find any info on such barrel. Does anyone know if this was actually produced by S&W or is my co-worker mistaken on some of his info. Thanks for any insight on this barrel.

[plouffedaddy]

http://www.smith-wesson.com/webapp/wcs/stores/servlet/Product4_750001_750051_802553_-1_757785_757784_757784_ProductDisplayErrorView_Y

^^^That's the new one but they've since changed the barrels. They used to use the 4140s when the MOEs first came out. I believe the OR rifles still use them. If his is the MOE with the carbine length gas system it may indeed have the barrel he's referring to...

[Split66]

The smith barrels are made for S&W by Thompson Center ( S&W owns them>)

None of the Smith 1/8 5R barrels are chromelined. They are ferritic nitrocarbonized aka tennifered aka melonited inside and out.
The advantages/downfalls of this process vs chromelining have been debated to a hilarious level here at M4C :D

The new Magpul spec has a 4150 CMV 1/8 twist 5R barrel with the above treatment.

The old MOE edition was 4140 steel 1/9 twist chromelined with conventional rifling and a conventional profile. If this is the barrel he is trying to sell you it will be easily identifiable by having a 203 cut and 1/9 stamped on it.

The 4140 1/8 5R barrel has a heavier profile is featured on the M&P 15 Sport and M&P 15 T model rifles, and was never made available on the MOE edition.


Here is the spec sheet for the "old" MOE edition. Compare to the above that Plouffe posted.

http://www.smith-wesson.com/webapp/wcs/stores/servlet/Product4_750001_750051_764506_-1_757913_757798_757797_ProductDisplayErrorView_Y

[Merle]

I have a new barrel from a M&P sport for you to compare it to so you can rule it out.
http://i192.photobucket.com/albums/z198/merlebrooks/20120805_160707.jpg

And here is the only markings on it:
http://i192.photobucket.com/albums/z198/merlebrooks/20120805_160726.jpg

[MichaelW]

I have an M&P 15 MOE edition (not the middy) and it has
a 4140 Crhome lined 1x9 (not 1x8)

MW-

[hmbeal]

Thanks for all the replies. I will go ahead and purchase the barrel assembly and try to figure out what it really is because the deal is just to good.

[ariesfromhell]

the 1/8, 5r barrels are very accurate. youll be happy.