Sometimes, there is a fine line between someone wanting to do something themselves, and just letting others handle it.
I used to do plumbing work a long, long time ago; but I have no desire to change out a sewer main under my slab just because I could!
Nonetheless, these threads ALWAYS provide me with a good chuckle!
True, but changing a buffer or rotating a gas block (if that's even the problem) is a lot easier than changing a sewer main lol.
I'm a grumpy person and I found the original question a bit odd. AR's don't require a gunsmith to be built, anyone can do it. That's why they are assembled and not built. Building a 1911 with random parts is a lot more work than slapping an AR together. Point being, anyone can be an "AR Gunsmith" so asking who is the best is like asking which human on this planet can breathe the best.