There is two ways of 'slikin up the trigger'.
1. Put a couple of thousand rounds through it.
2. Follow the instruction below.
This was posted on Beretta forums last year......
I did a simple trigger job on mine using the patended "madmax" trigger guidelines.
here is the cowards version of it, since I'm too chicken to completely remove my trigger assembly,
3 things that improved my trigger ten folds,using a dremel with a polishing wheel soaked in oil.
1. there is a long transfer bar that runs along the side of the "boat" that the trigger group sits in, you can see it move back and up when you press the trigger, I polished this bar and the side of the reciever where they run past each other using a dremel with a polishing wheel.
2. uncock the hammer, on each side of the plastic hammer there was some leftover plastic that made the hammer fit snug inside the square recess that holds it before firing, I polished both side of the hammer and under it, polish alittle then test it,repeat,etc.. What a difference, took a couple of pounds off the pull as well as smooth it out, especially towards the end of the trigger pull, right before it let go to strike the firing pin, it felt like a gremlin was inside the gun holding on to the hammer at the last second.
3. this one is a your own risk,
the ridge where the hammer catches inside the square needs a small amout of polishing, and I mean small, I did the indent in the hammer as well as the square cutout it catches on, "medium speed" and very little pressure, that nocked a couple of ounces of the pull.
of the 3 steps I mentioned #2 had the most effect,keep the dremel moving so you don't melt the plastic, and use light pressure, recock the hammer and check it, repeat until your happy, If I get time I'll post a pick to explain better