You are correct about that 'D' spring being a 16lb spring weight. Factory on the newer guns (last decade or so at least) is 20lbs. Older guns came with the 16lb spring factory.
Same guys go up a slight bit on their recoil spring weight when running the D spring to make up for the slight increase in rearward slide velocity due to that spring being lighter than factory. Factory weight there is 13lbs and some will go up to a 14. Personally, I think 13 is a bit much and leave as is or go down one but...
You can go lighter than that D spring and still have reliable ignition. IIRC I went down to 12lbs at one point before my CCI primers would not light off 100%. Federal primers - being softer - will let you go down even lower before they become unreliable.
If you are handloading and can pick and choose your primers for the particular gun - That Beretta can easily be tuned to have a VERY light trigger in seconds.
Other than swapping the hammer spring for something lighter I also like to run the reduced power Wolff trigger return springs to lighten the trigger pull in my Berettas a bit more. That change is like a free lunch that does not effect slide velocity at all. The only thing that (trigger return) spring does is push the trigger forward again after each shot is fired. (additional spring weight you have to pull against to fire) The Wolff version is also known as the INS spring (immigration and naturalization service) as that is why it was developed in the first place. They were reporting a lot of broken factory Beretta trigger return springs in their duty firearms so the INS spring came about to solve that problem. Due to the design change the INS spring can't break like the factory Beretta spring can. Not possible... Also can be had in different weights of trigger return. (Lighter than factory, standard, and heavier than factory) Cheap insurance in my opinion.
The stuff I read about the Girsan pistol you have claimed that they come with all metal parts unlike the newer Beretta pistols that have a bunch of plastic bits tossed in here and there (bean counting, penny pinching bastards
)
Depending on how close your trigger is to the original Beretta steel trigger the INS spring may work for you. It does not fit the newer plastic triggers that Beretta makes without seriously hacking on them. The better bet is to toss the plastic triggers in the trash where they belong and buy the original steel trigger and be done with it...
INS spring / trigger return spring has no function other than to push the trigger back forward again. Worthwhile upgrade in my opinion from both trigger feel and reliability standpoints.
What they look like installed:
Wishing you luck with your Girsan and your shooting sir.
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