We recently had some vehicle burglaries in my neighborhood. After checking our video surveillance system, the thug with gun in hand checked my vehicle for unlocked doors and shined a flashlight inside looking for valuables. Fortunately nothing was stolen. I thought to myself, this person could have targeted my home and I haven't fired my home defense AR in over two years. So, Sunday I took it to the range and the second round was a MISFIRE. Scary. I have always used Remington UMS 55 grain and have never had an issue. I want to upgrade my ammo in all of the loaded mags I keep in the house. I guy at work suggested Federal HST. What rounds do you keep in your first response mags?