For starters (sorry this is a pet peeve of mine) it's Ultra Compact not Ultra Carry (says right on the slide).
As far as night sights, Optics Planet sells the Meprolight Night Sights for Bersa Thunder Pistols (http://www.opticsplanet.com/meprolight-night-sights-for-bersa-thunder-pistols.html).
Mornin dalefan88,
I'm going this route. The rear number (height) is the same, #8, but the front is #7 where as the stock ones are #6. That will get away from the so called "Combat sights" which I think suck. It should raise the POI 1", that should give me the 6 O'clock hold.
This is for my 9UC.
Here's more info for you, (at bottom of the page).
I do believe that any sight that will fit the Sig 220 and/or the 226 will fit my Bersa.