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Yup. Buffer tube should have a small "cut out" for lack of a better term that meets up to the pin.Not very good pictures, sorry.
There should be an indentation in the buffer tube for the pin to sit in(the 2nd pic), I think. I've done 2 ARs, and both of mine did.
Pproblem solved....started threading from a different point and now it's perfect.
Thanks for the tip