I reinstalled mine on a new upper a few weeks ago. I had to really play around with the Delta ring before it finally snapped into the correct position. It was the first time I've ever had an issue installing one. I figured that it it was the delta ring / spring but what it actually was - was the barrel nut. After swapping it out with another, it snapped right in place like it usually does. I think the engagement point on the RAS did not perfectly align with the tines on the barrel nut either due to poor machining of the nut or tolerance stacking between parts. Hope you get it figured out.
“I predict future happiness for Americans, if they can prevent the government from wasting the labors of the people under the pretense of taking care of them.”
Thomas Jefferson
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