Ordered a new TacStar mag extension last year, but never installed. Well, some of the family wanted to go shooting at our local range. So, I installed the mag extension. Tightened very nicely, but definitely didn't overtight. I then installed a barrel clamp.
On the way to the range I snagged a 100-pack of Federal bird shots from Wal-Mart.
Fast forward to the shooting. After about 25 shells fired/cycled...I noticed I can hear the spring when all shells are spent. I take a look at my mag extension and the tube had backed-out of its threaded knuckle about a quarter of an inch. Of course at that moment I stopped firing the shotgun and quickly removed it.
I'm definitely not going cheap buying another mag extension.
Here are the pics: