The same Centennial Gun Club that sells out of spec AR15 lowers and refuses to take them back or replace? That Centennial Gun Club?
I don't know anything about that. I was just looking at the OP's question. They've worked on things for me there, so I figured it couldn't hurt to suggest it.
"There is nothing in the world so permanent as a temporary emergency." - Robert A Heinlein The Moon is a Harsh Mistress