I want to buy some parts for my SR-556. Ones that are showing wear and others that I think might be a good idea (springs). I did all my research up front using my user manual as a parts guide. I waited 20-something minutes, 17th in line to get to talk to a guy who then tells me the bolt I want to order is 'factory fit only'. While they have factory fit parts marked with an '*' in my manual, the bolt is not one of them. My bolt is showing a circle wear pattern from primer leakage gasses. So then I figure I would at least get prices for the remainder and then worry about the bolt later. We talk briefly about part numbers, then the guy says wait a moment and DROPS MY CALL! I call back again and they only take messages. I leave all my details, including what I want prices on. It is now the following week. Have I heard from them. NO! This kind of service is BS, especially with your hands tied on parts. I guess I should have bought a standard pattern AR15.