I’m not so convinced of the strength of the Jones underlever concept, especially without a rib extension that keeps the barrels on the action face while firing. In most cases on a JU action the lockup is much closer to the hinge(than a typical underbite), this decreasing it’s advantage, even when considering the longer bar found on JU guns. Fitting on the draw/circle changes things, but let’s be real…most guns aren’t. You also have to consider the quality and deterioration of said guns. But that’s just one man’s opinion.
I was just sent a couple photos of a Henry with a Jones underlever. It's a .450-3.25". Since you had mentioned this distance from the hinge pin, I noticed that water table on this gun seems to be much longer than usual and the distance from the lever axel to the hinge pin is actually quite long. This is just hairy-eyeball guestimation, but it looks like that distance might be at least as long as a double underbite shotgun. I don't know if this is typical of Jones underlevers, of course, but might be something to look at.
![[Linked Image from i.imgur.com]](https://i.imgur.com/qclHjMQ.jpg)
