The Beretta sight uses a wider dovetail than the Girsan. I ordered one from Brownells,Beretta part no c60428, and it will not fit into the Girsan dovetail. I took a file to the sight and took about 0.30" off it to get it to slide in the dovetail. Once it's in it is also very close to being physically too wide for the slide.It just barely clears the safety lever on the left side by thousandths of an inch.It's not touching but it's REALLY close. Haven't had a chance to get to the range yet to sight it in and see if it will help my point of aim.There are some reports of it shooting too high with the adjustable.
My problem of hitting low tends to be from using low powered reloads I believe.I don't crank up the powder in anything I'm loading and always find any new gun I get hits low.Generally I load things down to the point where they work reliably without feeding issues and that's where I stay.I've accepted that I usually need to put an adjustable rear sight on anything I buy.Actually I'm looking for an adjustable now for an STI I bought last week.It's hitting about 4" low with my reloads.