15-20 years ago I purchased a new 20 gauge semi auto. I seemed to cycle stiff and I was oiling it and trying to get it to cycle more smoothly. I put a pair of shells in, pulled and dropped the bolt, double slam fire full auto and 2 holes in the ceiling and roof. Yep told most everyone I knew about it. I guess the reason I told everyone was as a safety leson that I learned the hard way and I was really thankful that I had the thing pointed straight up as my son was sitting about 4' away at the time.