After long debate I broke down and purchased an Hk MR556A1. The price was a hold up for me, but after shooting one, I knew, " it must be mine". This is truly the best built AR type rifle I have ever handled. It is a sub MOA gun, if the operator can do their part. After buying it and comparing it to LWRC or Adams piston AR's the only thing they have in common is the look. I have never shot an AR that stays cleaner or requires less lubrication to keep it running. Even Larry Vickers says this is the Rifle that All other piston AR's will ever be compared to.