Yeah I have done it.
I did it to one of the MK96's that I had. I wanted to have a short outer barrel, but didn't want to cut the stock barrel.
And nope I was able to "thread" the tube to fit. As it was a shy smaller than the diameter of the receiver, I used some JB weld to make the threads. A little work around the area for the hop up and everything worked out great.
Heck if you find a handle with ribs in it, that would look really sweet as well