Can someone identify the barrel for me please?

[isakhnov]

I went shooting on Saturday and the guy next to me was really interested in the barrel manufactures of my rifle. Grant had built the upper for me last year and I can no longer find the receipt. After taking the lower part of VIS I can see the N stamping on the barrel, see image link below.
http://picasaweb.google.com/isakhnov/20080908?authkey=2BEznARWWho#5251667299605938834

[Robb Jensen]

Looks kinda like a Noveske barrel.

[Boltgun]

GotM4 is likely correct, but to be sure, go to the front and look under the rail - peek through the vent holes. Noveske has more markings than that I think...mine does atleast.

Boltgun

[isakhnov]

I could not see any other markings there