Re: What is the diff between Larue and Noveske barrels
I believe that John Noveske offers two types of barrels: stainless polygonal with a proprietary chamber (Pac-Nor blanks IIRC) and M249 Machine Gun barrel steel, with heavy M249 Chrome Lining and NATO chamber (for 5.56). The gas blocks are pinned, and the barrel extensions have extended feed ramps.
I believe that LaRue's barrels are Lothar-Walther polygonal with Wylde chamber (.223), set-screwed gas block, and standard rifle feed ramps in the extension.
Quality and customer service are excellent from both.