I run IMI 55gr 5.56 through all of my AR's when at the range, and my Stag M8 with it's 1/9 twist barrel lives on the stuff. I've found it to be not only reliable and accurate, but also high quality stuff for what you're paying. I do want to get a hold of some of the MEN german stuff eventually. But the IMI ammo hasn't let me down yet. I also use their 77gr Razor Core in my HK MR556 when I want to run 77gr but not dip into my Black hills 77gr TMK's. The IMI stuff is great.