Assuming they didn't weld or otherwise permanently attach it, removal is easy. At the rear of the hider is a split section sticking down, there should be a small washer in the split with a single pin passing through both "ears" and the washer. Drive the pin out and remove the washer. There is a slot cut in the bbl that the washer fit down into, once it is gone the hider will unscrew. Been a while, but IIRC the threads are right hand.