After shooting several hundred rounds I decided it was time for a deep cleaning. The GF's gun barrel removed "Just like the video". Mine won't come off. Tried putting Liquid Wrench on it, still no. Also tried putting an empty shell in chamber and tapping with a dowel. No again. Sent an email to Browning last week, they haven't got back to me yet. Is this a common problem with this gun? Any idea on how to get the barrel off? Was bought brand new a year ago and is a 20 gage.