There was a gas trap M1rifle serial number 7114 that was secretly sent to England
in May 1939 for examination and
conversion to a full auto machine rifle. British code name was Y.S.L. (Yankee Self loader). Billy Pyle's book "The Gas
Trap Garand" shows all the photos plus the British drawings of the full auto parts used for the conversion to full auto.
This rifle is in the MoD Pattern Room collection