These came out of Small arm Ordnance repair tool sets I bought in the early 1990's ! All of the bolts I recently found in the last box are USGI New bolts thoughtfully converted to Field test Bolts at great expense. The rear of the bolt was welded shut as well as the firing ping hole before conversion ad Anniston to the field test version. They are all Marked ANAD with an electro-penciled date, as well as an embossed designation on the bolt flat I have like 50 of each left, I just need to clean the dried grease off before picturing them tomorrow price on either type is $79.00 each shipped priority mail, Both for $150.00 -- Will accept Paypal as a gift for these or regular Paypal plus 4% Thanks for looking-- I may also be selling some other ordnance related items; please let me know your needs ! As I may have the stuff lying around !!