I've seen that happen more than once during the shotgun courses at Front Sight. That's why I run a Mesa side saddle. I don't need the hassle.I had a Tac-Star Sidesaddle. It held up nicely... At first, but I am a heavy shooter, mainly shooting 2 3/4 inch slugs, atleast two boxes a week. And after about 3 months the six screws holding the actual saddle together came apart and completely just broke off the gun. Leaving a cool metal plate on the left side of the gun held by the two (bolts?) to the receiver through the trigger grouping.
I'm not sure I can standby something that comes apart like that. But it held the shells decently.