RecentlyI had a Beretta 391 come to me (Ret LEO Armorer/local guin-issue first responder). Never worked on one before- did the YouTube thing and the mag cap would not come off-called the owner-he said use vise-grips-I do! I had to(with padding & hammer) after solvent soak, Got it off. Per video-cleaned action w/o any oil/cleaner-steel wool only. Gun which was a FTE/ FTF worked for about 30 rounds and started the FTFeed/ thing again. Any suggestions?