I have reason to believe that my Bushmaster AR-15 with a Fulton Armory stainless bull barrel is getting too much pressure to the BCG, so I ordered an adjustable gas block from Wilson Combat. As I mentioned, it has a bull barrel and needs a .936" ID gas block, which is the size I ordered. The order arrived today and upon opening it I discovered they sent me a .750" gas block. I checked the packing slip and it said it was a .936" gas block. I got on the phone right away with them, and the woman I spoke to said I'd need an RMA for the return, but that their system was down so she couldn't generate one right now. She suggested calling back in a couple of hours. When I called back about 3 hours later I got the same confusing phone tree that I did on the first call, where if you actually choose the "Customer Service" option you get shuffled off to a list of voicemail boxes you can leave a message in. You actually have to get the operator on the line and tell her you have an incorrect order if you want to get to the live person who can actually help you. Well, on this second call, after getting to the operator and asking for the correct department, I waited on hold for 30 minutes listening to their continuous advertising about how great their products and customer service are. Let's see, incorrect parts shipped, a phone tree that directs you to a dead end, a computerized ordering system that doesn't work, and an insufficient number of CSRs to handle the call volume. I don't call that "excellent customer service". We'll see how this turns out, but they have a long way to go to inspire any confidence in them on my part.