BM59 M1 Garand BoltBM59 M1 Garand Bolts. Beretta (PB) modified USGI M1 Garand Bolts for use in their BM59 variants. Two modified and marked BM59 bolts are available and pictured, first two pictures. Pictures three through five show the underside cut modifications PB did to use these bolts on the BM59 variant. These underside cuts also created a wider extractor slot on bolt face, as seen in pictures. Only two available so select quantity desired when adding to cart.