Then you may want to check out this thread from AR15.com. The very last post I made details how I easily removed it and what I plan to replace it with. I've just noticed a bunch of people asking various questions regarding the factory gas block. I finally decided to just do away with it and will...
I am in the same boat as the OP. I just bought the M&P15OR and am contemplating with BUIS's to by. From what I've read I may need a low profile front sight since the gas block rail is even with the upper rail. Want a set that won't break the bank......