I am new to M14, still learing. In process of building up an M14 from CMP kit. Need a bolt. I see several people make forged bolts to USGI spec, and of course there seem to be used USGI, and a few new on gun broker and such. What is the feeling of the experts here regards, a new LRB bolt, a NOS USGI bolt, or a used USGI bolt? Realizing of course that a new NOS USGI bolt costs near double the LRB bolt. Interested in any opinions on this, and any ideas on where to get USGI bolts besided Gun broker?