bought a new Ruger Ar556 after I sold my 20 year old Rock River, got the Ruger for 358 out the door after I traded a 22 in on it. This Ruger is just being used as a plinking backyard range toy. When I came home, I checked my ammo stash and realize that I only had some very old Tula on hand. Multiple extraction issues, double feeds and then even not picking up the second round when it did fire. I then went and bought some Winchester, Remington 55 grain and 62 grains in both 556 and 223. No problems at all and the brass landed in a neat pile at 4:00. Does anyone suggest putting a heavy buffer in it since it is carbine length or just shoot the crap out of it