Beretta PX4 Storm Parts. What does each part do and how?

Know your pistol and how it works

This is a thread intended to open discussion and sharing of knowledge about the PX4 Storm and how it works.

Why does the trigger make a click when it resets? What made it need to reset?
What tells the hammer if it is a double action pull or single action?
How does that decock/safety lever drop the hammer?
Which parts interact with which others to make it all happen and happen safely?

Beretta boasts on their website of the PX4 Storm "... Fewer parts=fewer and more solid components bearing stress...." Actually... that's true.

We will try to make the apparently complicated seem simple.

Attachment 23420

I wonder if the APX has even less parts? Looking forward to the thread.

This is a close up view of a standard PX4 type F or G hammer

The top pointer shows the half-cock notch or ledge.

The next one down is the full-cock notch or ledge.

These 2 ^^^ interact with the sear.

The third one down is the double action hook. The trigger bar grabs it to make your hammer cycle through double action.

The fourth from the top is your cocking cog or leg. It is what pushes your trigger bar forward (& your trigger back) when you or the slide cock the hammer.


2 interact with the sear, 2 with the trigger bar.

Attachment 23425

This is a trigger bar from a PX4 Storm .45 SD

The 2 pointed out spots sit between the 2 contact points of the previous hammer picture. On the hammer picture- it sits between the 3rd & 4th pointers from the top.
The left pointer shows the cog that will grab the double action hook to cock the hammer during double action. After the hammer hook has pivoted out of the way this same spot will push the sear forward to let the hammer fall unimpeded.
In single action mode this cog sits near the sear. This is why the double action stroke of the hammer is shorter than in single action. When the free play is taken up and you hit that "wall" it is this cog touching the sear. The free play is there so that it would still work full of dirt, mud or goop. When you press the trigger it pushes the sear forward, releasing the hammer.
Additional note: The time and distance of the free hammer fall is called, “lock-time”.

The right pointer shows the cog that the hammer pushes on to cock the trigger back, when the hammer goes back.

Attachment 23427


In this picture, the lower pointer shows the spot that pushes forward on the bottom foot of the firing pin block plunger lever. The firing pin block plunger stem is that small thing that pops up on your top-strap, just in front of your rear sight. When the plunger is up it is not blocking the firing pin. This causes the firing pin to only be free to move when the trigger is all the way back.

The upper pointer shows the more dug in hiding spot for the bottom foot of the firing pin block plunger lever when the pistol has fired and the trigger bar is lowered to its deactivated position. That is why your firing pin block plunger stem is down after the shot, though you might still have the trigger held back.

Attachment 23428

I have very much enjoyed your contributions to this forum in a short timeframe, Storm Tracker. Please keep it coming.

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Originally Posted by LockedBreech

I have very much enjoyed your contributions to this forum in a short timeframe, Storm Tracker. Please keep it coming.

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I appreciate the opportunity to share all this!

Would love a pic or two showing how these interact.

Dude, you should have a YouTube channel. This is great stuff.

He is on point with this description of how it works. Well done sir!

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Originally Posted by LangdonTactical

He is on point with this description of how it works. Well done sir!

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Tango Yankee