yes. you'll either have to cut it above the gas tube area and grind it down to fit under a rail, or take it off and put on a lo-pro gas block of some kind.
Depending on the rail you choose you may have to remove the barrel nut and replace it with the provided one.
Videos
https://www.youtube.com/watch?v=sQvHdVw5eAE
https://www.youtube.com/watch?v=mfYpR6TLEMI
http://www.youtube.com/watch?v=hS_rkTnk914