M1 Garand Bolt Springfield 6528287-SA Heat Lot# Z-3 5.8 Mil RangeM1 Garand Bolt Springfield 6528287-SA Heat Lot Z-3. Bolt is stripped and has very nice original dark ODish finish with minor use wear. Appropriate for post WWII rifles in the 5.8 mil serial number range and later. One pictured available. Click on image for larger view of ACTUAL bolt available.