Ok plinking ammo, Silver/Golden Bear also makes it - "zinc plated steel case", some AR's don't like it, - miss fires,jamming,stuck shells,etc. -- Some say it is a little dirtier, more fouling, Buy a couple boxes to see if your AR likes it before you buy in quantity, If you don't have any problems - Go For it !! ---- Neal
PS - some indoor ranges only allow brass, no steel cases.