Just wanted to give everyone a heads up that Bersa is now making all Thunder 9, 40, and 45's with dovetail rear and front sights fully compatable with the SIG 220/226 starting these serial numbers:
Thunder 45 UC starting from serial # A76136
Thunder 9 & 40 HC # A80227
Thunder 9 & 40 UC # A80077
Unfortunately, anything older than the above numbers will not take after market sights. If you have any questions, just post them here and will will answer them.