Not only are their several tiers, it might be viewed as different aisles on the same tier.
For instance. Savage may make a rifle as rugged, dependable and close to as accurate as a Weatherby.
Based upon practical criteria, they both could be top tier, but Savage is not in the same class as Weatherby in terms of finish.
So, we might have something like Top Tier Standard (Savage), Top Tier Exclusive (Weatherby) and Top Tier Custom ( Les Bear)
I never think of Savage as a Top Gun Manufacturer but that is solely based on popularity, not quality. Do we even want to give popularity a weight in this ranking?
Kel-Tec is another good example for defining our criteria. Amazingly innovative and daring, actually creating, or spotlighting an existing niche, that is then jumped on by more established companies.
Great topic here...might come up with a DRTV Rating System