The Silver State ammo is appears to be high end super high quality ammo. http://www.ssarmory.com/556ammunition-70gr-leadfree.aspx All copper Open Tip, 2730 FPS Designation: 70 grain Barnes TSX-BT (Triple Shock) recommended twist rate 1-8 or faster Excellent barrier and hunting round I don't own an AR. My AK74 has a 10.5" 1:7 chrome lined barrel. Trying to decide between this ammo and Hornady 5.56 NATO LE TAP 75 gr. BTHP T2 http://www.hornadyle.com/products/rifle-ammunition/556-nato/75-gr-bthp-t2-tap And yup. Those kooky Bulgarians sure know how to build an AK. I'm glad I got a 100% Bulgarian gun. Manufactured and assembled at Arsenal AD (Арсенал АД in Kazanlak.