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.