Early M1 Rifle bolts

[Tom in N.J.]

The numbers on the bolt are not serial numbers they are drawing numbers, revisions, and heat lot codes. Both of the bolts shown are the original drawing number D 28287, no revision, heat lots J1 and D1. The first revision to the bolt was a hand added -1 below the drawing number on existing bolts. The first bolts manufactured as revision 1 were marked D 28287 -1 in one line.