Well, good luck to you! I understand that one might want to chop up the FSB to fit under a hand guard. I guess this saves a little money? Or is it that a new gas block will not fit at the proper location with that particular barrel contour? Just seems like a new gas block would look cleaner. A person could always sell the FSB. I'm just wondering why folks do this. I am not being critical or anything like that. I may just be missing something I don't know about. At any rate, good luck and I hope everything goes ok for you! Can't wait to see the pictures.