I opened up mine after it failed the dollar bill test.. ran a dollar bill down the length of the barrel and it kept hanging up in a couple of spots.. I took the barreled action out and wrapped 60 grit sandpaper around a 7/8" dowel.. finished it up with 220 until nice and smooth.. a little matte black spray paint and finished the job up.. looks factory, and now the barrel is completely free floated.. all said and done, it took about an hour..