I ran into a guy at the surplus and bulk ammo store the other day who was on his way out with a big crate of 5.45x39. He told me to check out centerfiresystems.com, which is where he'd bought his AK. I was just on the site and was thrilled to see M14 mags for way less than $30 a pop. Also noticed they have 5.56 for 24 cents a round, but it's described as being ".223, Polymer, FMJ, Russian Mfg, 62Gr" (http://www.centerfiresystems.com/AM223122.aspx). What's this polymer? Also, anyone know if this stuff is good to shoot in a Sig 556? 24 cents a round sure beats the 40 cents a round I was paying at the store for Federal or PMC 5.56.