Springfield called it "rolled" and sent many barreled receivers to repair for rolling to correct "light draw." I take this to mean the barrel didn't mate to the receiver correctly because the shoulder was a few thousandths short. Swageing squeezed it a bit longer. This was evidently done in the Model Room. On May 6, 1938 a group of 19 from 1060 to 2394 were sent and three days later 7 were sent back for more squeezing.