Were you able to keep the barrel at 16"? I have two of these uppers that I want to have the fake flash hider removed, the barrel threaded, and an A2 flash hider installed. I don't want the barrel cut down because I don't want to lose the velocity or have to have a perm. installed flash hider. I don't care what the barrel contour looks like. I just want to know if it can be done and done right. Pics/prices would be awesome.