I bought a bunch of American Eagle 5.56mm at Bi-Mart. It's Lake City brass. I was under impression that I needed to swage it before I could seat primers. So I was planning on buying the RCBS swager. That was until I picked up a case at the range that had a Lake City/NATO head stamp. Upon closer inspection of that case I saw what looked like four straight score lines surrounding the primer pocket (the crimp?). When I compared it to the American Eagle 5.56mm brass I didn't see score marks. So, I decided to try and seat a primer (CCI 400) in a American Eagle 5.56mm Lake City case. The primer went in without a problem. So I did a bunch more and they too went in without issue. Is this normal for this brass? Does it normally require swaging? Or was I under the wrong impression from the beginning? If you look closely at these two pieces of Lake City brass you will see the score marks I am talking about. Interestingly, the case on the right would not fit into my shell holder so I could not re-size/deprime it, whereas the case on the left fit fine.