Avoid Weaver and other Mounts.

Use adapters to make your rails NATO Stanag 4694.
(Older Pic rails work well enough.)

I think Bersa rails are okay, but be careful what you attach.

My Bersa 9 Pro HC Will Not Recoil-jam.

I've tried the weakest, weirdest holds trying to get a recoil malfuction.
No can do.
But 9mm Sigs and Glocks are jam-a-lots if not held TIGHT.