06-18-2011, 04:19 PM
They had stopped making them but had some left in stock. IIRC, they are made 9310 carpenter steel that is nitride/chrome plated of some sort. The lugs are radiused for stress relief. I run pretty hot loads out of my rifle and it just keeps on ticking. A beefier set up would be the ticket. Something like Oly Arms uses on their WSSM AR-15 uppers that looks like a modified AR-10 but then you start looking at high costs to change things around. I wonder what the % of grendel shooters vs the number of bolt failures is? I'm guessing it's pretty insignificant.