I was involved in the project on a consulting basis. Simmons was able to produce a monobloc'ed barrel set with a rib. Difficulties arose when people expected contoured barrels instead of straight tapered tubes , wall thickness less than about the thickness of an 870 barrel, a perfect fit between the frame face and the barrel breach, balance at the hinge , concave rib, Parker rib matting instead of generic matting, the matting to stop before the muzzle, barrels touching at the muzzle, and the monobloc to be in various sizes to correspond with the frame sizes.
Simmons owned only a used two axis CNC machine and expected to perform all work with that machine, and had little or no hand finishing or fitting capability.
Beyond that, there were no problems.
Simmons has produced small gauge barrel sets for the Superposed. If you are aware of those, or have seen them, that was an example of what the Parker barrel sets would be.
Simmons has changed owners since the Parker barrel adventure, and when last heard, the project was dead.
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