So about a year ago I made a deal with a buddy for an AR (in pieces). I did some work for him and got a barrel, complete upper, stock and the guts for the lower. Anyway, I picked up a lower and put it all together and everything works great. Now, my question is about the gas tube coming out of the barrel. My AR has a standard hand guard on it, approx. 9". Well, I just did a trade with another guy and got a grip pod and he threw in a couple other things. One of which is a longer quad rail. Here's my question.... Since this new quad rail goes past where the gas tube exits the barrel, am I even going to be able to use it? Is there any part that I can use to keep the barrel and gas tube in it's original position and still use the quad rail? After all, it was free so I'd like to use it. Thanks in advance!