IMHO, the Jones had a good run of some 40-50 years and served well. It was ultimately supplanted by other bolting systems, all of which were supplanted by the top lever (for practical consideration). The Jones gives away nothing in strength but is slower in reloading. I doubt manufacturing costs are much of an issue. The slower reloading is an issue only when your purpose requires increased firepower, say flurry competition. It was supplanted because more firepower could be had with equal, or at least adequate, strength. I enjoy shooting guns of Jones underlever bolting for novelty and honor of their antiquity. In its day it was a "great leap for mankind." That's catchy.
DDA
