The set screws do not seem to have anything to do with some type of barrel to frame fit adjustment. It is a 2 piece setup.....like a plunger with a set screw behind it. This setup allows the plunger to move if the set screw is loosened a bit. Therefore, I definitely think it was to secure something in the chamber.
Chamber diameter measures close to .700, which is normal. Chamber is 2 3/4 which at first I felt was lengthened, but the forcing cone is only 5/8". Normally I have seen longer cones in chambers lengthened later. MBWT at end of chamber is .100 or better.
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