The barrel will fit, the issue would be that when adding a moderator you will have clearance issues. The air tube will be longer than the barrel. If you had a barrel band and a Donny FL Tanto or Koi you might be able to clear it. Here is a picture of my Wildcat with 700mm barrel and the Donny FL Tanto. I have a barrel band that I 3D printed to keep the barrel from moving so much with a moderator on it. You run the risk of your moderator hitting the air tube.