Unless the regs have changed, as long as you're using loose powder, solid bullets & iron sights, w/o electric ignition, any muzzleloader is legal. You won't go wrong with knight though, I bought the ultralight for my 2018 CO muzzy hunt & love it.
Looks like he's stripped down to a 4-piece for these shows. Dude's a crazy talented musician, I'm gonna grit my teeth tolerate the arena for him cause I believe him when he says he'll disappear one day.
https://www.kentucky.com/entertainment/music-news-reviews/article240197842.html