Hello. I have an ar build going with a rosco 5.56 16inch heavy barrel and a lantac bcg. All components to this rifle are new. The rifle passes the field and no go test, the bcg will not close. But on the go gauge it will also not close without being pushed and its hard to pull the charging handle back. Could this be because everything is brand new or the bolt/barrel is out of spec. Also am using rimless foster gauges.