Receiver manufactured in 1955, later re-barreled and chambered for 7.62mm NATO. Springfield Armory "3-66" dated barrel with "7.62 MM" marking. National match sights including the "NM/062" front sight, "595" rear aperture, and "NM/2" rear sight base. Glass bedded stock. Reference pages 581-583 of the book "The M1 Garand Rifle" by Bruce Canfield for information on these rifles. White plastic magazine spacer absent.