I have a new Ruger Sr-556. Overall I am very satisfied with -- shots well and flawlessly -- it but the Troy Industries rail guards that came with the gun are a tolal POS!!! For the life of me, I can't understand why Ruger invested so heavily in this gun to enter into the AR marketplace and sell it with a totally worthless (frankly worse than worthless) set of rail guards like the Troy Industries version. They rattle and shake and come loose at the worst possible times. I only have about a thousand pampered rounds through the rifle and the railguards will come completely loose after just a couple of shots. I have to be sure and hold the rifle by something else or I am afraid the gun will fall to the deck. I have ordered replacements (from someone else). I am wondering if anyone elseis having the same experience / has the same opinion.