M1 Garand Springfield Early Bolt D28287-2 B1 May 1940 onEarly M1 Garand Bolt. Springfield production with D28287-2 Drawing # and Heat Lot B1, seen on May 1940 and later (SN# range 38,035 on). Bolt is stripped and is a very dark original finish. One pictured available. Click on image for larger view of bolt available.