Gas port maybe, pin holes, No. Not if it is a replacement barrel. Virgin, or USA made. A pulled barrel, (used) gas port be drilled and would have pin holes drilled, though not necessarily lining up properly.I haven't yet shot it. Are barrels usually drilled for the gas block?
No it's on the top. Lining right underneath the gas port.Is this on the bottom side of the barrel?
Waiting on that bore scope. I'll snap some photos and update this thread.well thats a good thing ,take a side view and show about were it is on the barrel and if ya got good machinist feeling hands take a small scribe with an 90 degree end and "feel" the defect in the bore