Update: A wee bit of progress today. I was able to use the spare Delta ring assembly and fit it around the top portion of the HG (i.e. barrel nut teeth inside rear HG grove. So I have a little confidence in that. We'll see after I get the gas tube assembly completed, which is my next big task. With those two done, I can mount upper to lower, put on the stock, and get if finalized.
We'll see.
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