I had a look at the bolt last night - it is marked "8" and a punch mark under the bolt root, and "S" under the locking lug. It only has one gas hole near the front of the bolt, not another behind it and one in the side like a late NS bolt. The handle has been thinned down quite a bit from a military one. Is there any issue with the steel in the bolts from a low number rifle, as long as headspace is ok? I have always heard of problems with the receiver, not the bolt itself.