First of all, welcome to Bersa Talk.
Remember when you signed on, there was a disclaimer about nothing we say here at Bersa Talk is guaranteed to be accurate in any way? Okay.
Check out this thread.
http://bersatalk.com/forums/thread/67541.aspx
Good luck. Keep in mind that Bersa doesn't guarantee that Thunder Plus mags will work in anything except the Thunder Plus.
A good reliable source for genuine Bersa factory magazines is Condor's Flight.
p-t-max
I'm no expert, I'm just, well---opinionated!
http://blog648.blogspot.com/