Not to put words into Blue's mouth, but, IMHO, he's just pointing out that the particular bolt in that BCG is being advertised as "Mil-Spec" as indicated by the arrows he drew.
While the bolt from 9310 may well be every bit as good or better than what the Mil-Spec calls for, which is C-158, it's still not "Mil-Spec" from the material standpoint, hence the advertising is somewhat misleading (for many) & is not accurate in calling that bolt "Mil-Spec". And they are NOT selling that bolt to any agency that is specifying & buying to Mil-Spec requirements, which is implied in their write up. (Why do you think that people like Toolcraft & Colt still make bolts about of C-158? Actually TC uses both materials, but anything going to a .gov, buying to "Mil-Spec", is C-158)
It has nothing to do with whether that particular bolt from that particular manufacturer is either good or bad.
Just the way it is..........................
But for all you all, make of it what you like, & buy whatever makes you happy from whoever you want to buy from.
MM
