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Hope I didn't cross as an ass.. didn't mean to. Understood +very important data. Still, 100% reliability is not all about the hammer spring.
I have a PX4 with competition setup that uses a filed...

Many ran the 10Lb spring on the PX4 with no issues and I’m sure some do have issues.
It’s mostly about personal trial and error.
For range guns I can live with a light strike if it’s rare. ...

Small correction... Bolt is M2.5 0.45 (Not M2)

I'll be using Stainless Steel bolt M2 0.45 flat hex head

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and file the bolt head to the exact width of the drilled surface like this

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I mentioned the option to install a Beretta Match Hammer which shortens the SA take-up and is also lightweight and skeletonized.
It has a shorter fixed pre travel (Take-Up) compare to all other...

You're very welcome.
Shoot straight

#10 worked reliably on all my PX4s even with harder rifle primers (nato ammo).

I believe Fully Auto firearms are prohibited. Mostly.. :D

I do own the LTT CC equipped with their NP3 bar. Geometry is the same but it’s not as smooth as a lubed polished steel modified OEM bar.
Also, I’m not sure of it, but I heard LTT stopped offering...

Simplifying the friction values..
The lower the better.

For lubricated surfaces min values are:
NP3 = 0.07
DLC = 0.02
Polished hard steel = 0.03

For dry surfaces min values are:
NP3 =...

DLC is far superior to NP3 in both hardness and Thinness.
Lubricity is no issue as I lube my MP4. See the following comparison table.
Pivot pins take a drop of oil (not grease).

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Thanks!
NP3 is great until it wears off and exposes the bare steel, and it happened pretty fast on the one sample that I use.
I have a fully optioned CC LTT with NP3 and it is missing the coating...

3 - Springs weight

There are a few springs that affect trigger behavior: Hammer spring, Trigger spring, Sear spring and Triger Bar spring.
All of these need a break-in period so expect about 20%...

2 - Hammer and Seer engagement surfaces geometry and friction

Remove Trigger Group and original Trigger Bar

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Here's the modified bar next to the original

Polished Trigger Bar including all engagement surfaces.
Careful not to change the geometry and surfaces. Only polish!

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1 - Trigger Bar geometry and friction with the polymer wall

Beretta ships all PX4s with pretty much the same notched Trigger Bar.
If you prefer a short SA reset (about 0.1") the notch needs to be...

As a long time PX4 owner it's great to see its reemergence and for very good reasons TMHO.
I've seen some of the available tweaks and after market parts available today but wanted to give you an old...

test

What are the exact differences in the lower between the new g-sd/CC2 to the standard PX4 models.
The ones that I have are virtually identical.
The CC2 appears to be a downgrade from my original...

Except for the heavier barrel on the G-SD, what is the difference INTERNALY between the standard PX-4s and the new two models?

On the Beretta web site it states:
IMPROVED DOUBLE ACTION TRIGGER...