M1 Garand Bolt Springfield 6528287-SA US1 4.2-4.22 mil useM1 Garand Bolt Springfield 6528287-SA Heat Lot US1. Bolt is stripped and has very nice original finish with use wear. Bolt is appropriate for post WWII rifles in the 4.20 to 4.22 mil serial number range and later. Hard to find early post war bolt. Click on image for larger view of actual bolt.