Thanks Tom.
That is one of those cussed little details ! Your commercial upper is way nicer than is needed for this project- though I may need to go there anyway!
If I do wind up with a short receiver, I can make a "breeching washer"; but buying one would be a lot quicker.
The key to the "rest of the story" is going to be the receiver for sure.
Thanks for the observations and support!
Alanint,
We'll see for sure if it is alive on Tuesday when I go to the range!
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