...and because it doesn't use bent parts that act as extractors and double as springs and must be filed just so, and because it doesn't have a multi-piece variable-geometry dangling link attached to the barrel, and because it has an integral feed-ramp and a geometry that allows rounds to feed at a very low angle into the chamber vs. angling upward and having to wedge their rims between the extractor cum extractor spring and then re-orient to go into the chamber.
It's not just tolerances. It's superior design.
That said, my Noveske upper and lower DO fit tighter than any Colt I have hefted
As to the barrel, heat kills barrels. I think that how a barrel manages heat will play a big role in things. What is S&W's profile vs. Noveske's? I think this matters a lot.




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