I have several complete BCGs in both small frame (AR15) and large frame (LR-308/AR10) with the nitrided 9310 bolt and haven't had any issues with them, the bolt carrier is worth the $60. If I didn't have a half dozen or more in the parts bin, I would buy the 3 limit.
I have zero problems with using 9310 bolts, but only from known reliable sources..................everyone's 9310 & the heat treatment of the raw material it came from, are not all equal.
But suit yourself.
I'm gonna pass on bolts from SurplusAmmo, even if they were free.
MM
