Bolt Apr 18, 2011 23:56:45 GMT -8 Quote Select PostDeselect PostLink to PostMemberGive GiftBack to Top Post by 244 on Apr 18, 2011 23:56:45 GMT -8 I'm really wanting to build ARs in .204 Ruger and a 6.5/LBC. I figure I may as well get a complete BCG at the same time, but I have some questions that I haven't been able to find the answers to.I'm curious as to what steel is used in the bolt carrier and the bolt itself. I assume that these are not made by BHW, but that is only a guess.Is the 5.56 bolt made of Carpenter 158 or (hopefully) 9310? Same question for the 6.5 which would benefit from the stronger 9310 due to the thinner skirt of the bolt face. 8620 for the carrier?Are the 6.5 bolts the "standard" 7.62x39 Russian bolts (for headspace purposes) or do they follow the Alexander Arms pattern?What kind of testing (batch/individual) must the bolts pass, like MPI/HP? Are they warrantied at all? Thanks for any answers!