I bought an AK-47 a year ago and when I got it I noticed that the barrel lenght measures about 17 inches if I recall correctly. It originally had a simple muzzle nut on it. I ordered a Tapco muzzle brake that added an extra inch and a half so it now measures over 18 inches. My question is from what I understood a barrel needs to be 18 inches to be legal unless you have the federal paperwork for a short barreled rifle. Are AK's with less than 18 inch barrels legal because thats the way they were manufactured, and does adding a muzzle break really count towards the overall length anyways?