I think the technical name for the area right between the barrel and the action is "Taint".
Taint is a contraction coming from the full description of that area; i.e. "It ain't action and it ain't barrel".
Or said in a more colloquial way, "Taint action, Taint Barrel". Hence the word "Taint".
I could be wrong though and I want to make it clear I'm not an actual gunsmith. My major in collage was anatomy.
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