I have about 5 or 6 Knight muzzle-loaders, mostly older stock Elites and Extremes, one newer Mountaineer. It's the only brand I'd hunt with, sold my last non-Knight a few years ago.
I've been hunting with a 45 cal Elite the last few years. One thing that's nice with the older Elites and Extremes is just about all the breech plugs, and bolt components are interchangeable. The new ones are still excellent quality, the best triggers too.
