The stock needs proper fit and torque, if the barrel is touching any part of the barrel channel then it isn't free, and wont group tightly.
I would add the old dollar bill test is really not enough room . Meaning if a dollar bill slides freely between the barrel and the stock but just barely thats not enough room . If you can force the barrel and stock to touch by pinching them together with your thumb and fore finger . IMO there is not enough room between the barrel and stock or the stock has to much movement . This could mean the stock is not ridgid enough or is not torqued down properly .
Just my .02
First they came for the communists, and I did not speak out - because I was not a communist , Then they came for the socialists, and I did not speak out - because I was not a socialist , Then they came for the trade unionists, and I did not speak out - because I was not a trade unionist , Then they came for the Jews, and I did not speak out - because I was not a Jew , Then they came for me - and there was no one left to speak out for me.