Reducing the length of any barrel below 18", regardless of whether it is already less than 18" in the restricted class, will make it a prohibited firearm. Getting caught will cause you to loose you rights to own firearms. You can however replace the barrel with an newly manufactured barrel of a reduced length. It doesn't make sense... I know. The law is clear and there is precidence in court to support the decision. You can cut a barrel down to 18 inches however, just not past.
I believe you are wrong. People shorten AR15 barrels all the time.




















































