Originally Posted by
Pnut
Something’s definitely wrong with your barrel clamp. It’s either stripped, not threaded, or the threaded insert isn’t lined up. I know you tried threading the bolt with no success, but have you tried to thread it with the two haves separated? That way you could determine if it’s threaded or not.
I’d contact Beretta to get a new one. I don’t think the aftermarket clamps work with the Beretta tube. Either way, a cheap or temporary solution would be to drill out the thread insert and just use a longer bolt and a nut.