There seems to be a few topics which will cause your recommendations to spiral into conspiracy theory nonsense pretty quickly. Unfortunately you’ve got to be very careful with any gun content in YouTube as they almost always lead to bullshit in your feed.

Garand Thumb videos I've seen have been very good. Like the one about what supersonic rounds sound like going overhead. I'd guess there's somewhat less overlap with his content and conspiracy stuff.

Content aside, I hate the click bait titles a lot of big channels employ. Garand thumb included.

I click "don't show this channel" on those

There's a browser extension that replaces them, but I feel that just highlights how the default experiemce is targeted at stealing people's attention.