A gun smith can machine it down for you so that it looks like a low-profile gas block (the best way) then put a free float rail over it so it appears as tho you have nothing...
Or you can install a Low profile gas black and tinker with the gas return hole... I like the first way as they will both look the same only the original is all ready fitted to your gun... you don't wanna have cycling and reliability issues.....NORTH BAY HUH......Call Tactical Ordnance he is a great gun smith