No issues currently through Rock River, Anderson Arms, Colt and Diamondback AR Rifles and Pistols. I still would start with a small purchase to test how it runs in your firearm then stocking up if it passes muster. Cheers and stay safe!

Alex, depends on the AR. I have a 16 inch rifle that runs literally everything I've tried steel, brass, polymer coated anything flawlessly. Then I have a 10.5 inch radical firearms rf15 pistol that doesn't like steel cased ammo. Unfortunately it's a buy and find out situation because like you could have two identical AR-15s and one could run great with it the other one could jam every round. I'd buy a box or two and if it works great stock up, if not you know better next time. But yes issues with steel in AR-15s is somewhat common. Hope this helps.