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Work order — Beretta PX4 Storm

Taking the firearm apart for a job such as refinishing, and putting it back together to specification. Generated from the Pew-Takedown entry last updated 2026-10-29. Confidence: medium.

Shop difficulty: Tier 2 of 3

No parts count found. A DA/SA rotating-barrel pistol with a removable hammer unit, a central cam block and a magazine release that must be held against its spring while the pin is re-engaged; Beretta puts all work past the field strip, including the hammer unit, with a competent gunsmith. Rated with the 92FS on design, not on counted parts. 67 parts (complete PX4 Storm Full Size incl. magazine (keys 62-66) per the Beretta exploded view reproduced on berettaweb.com: drawing callouts 1-67; the accompanying parts table names 62 of them by Beretta par). Pew-Takedown's rating, not the manufacturer's.

Bench time: strip ~30 min, rebuild ~45 min (estimate). Actual: strip ______ rebuild ______

Special tools:

• Drift punch sized to the magazine release pin hole — Magazine release button pin
• Small hammer — Seating the backstrap U-spring

Watch for:

• Beretta restricts everything past the field strip to a competent gunsmith. (both; Beretta U.S.A. Corp.)
• The hammer mechanism is a separate unit that comes out without special tools, but Beretta still classes its removal as gunsmith work. (both; Beretta U.S.A. Corp.)
• The magazine release button and spring must be held in their seat with one finger while the internal pin on the other side is pushed home to capture them. (reassembly; Beretta U.S.A. Corp.)

1. Clear and make safe

1. Point the muzzle in a safe direction and keep your finger off the trigger.
2. Press the magazine release and remove the magazine.
3. Retract the slide fully to eject any chambered round and lock it open.
4. Visually inspect the chamber and magazine well, then physically feel the chamber to confirm it is empty.
   Warning: Look and feel. Both, every time.
5. Remove all live ammunition from the work area.

2. Disassemble

Field Strip

1. Complete the Clear and Make Safe procedure, release the slide forward, and place the safety lever in the fire position.
2. Press and hold the disassembly latch release button on the right side of the frame.
3. While holding the button, rotate the disassembly latch on the left side of the frame downward until it stops.
4. Push the slide assembly forward and off the front of the frame.
5. Lift the recoil spring assembly out of the inverted slide.
   Warning: Under spring tension — keep a thumb on it.
6. Lift the barrel and its rotating cam block out of the slide.
   Tip: The barrel lifts out with its cam block as a unit. Note its orientation.

3. Refinish

The components the procedures above separate. Coating, masking and cure are outside this database; follow your coating system's instructions. A part the manufacturer marks "factory fit" should not be swapped or reworked.

4. Reassemble

Reassembly

1. Set the barrel assembly into the inverted slide in its correct orientation and seat it fully forward.
2. Seat the recoil spring assembly into the barrel lug cut and press it down into the slide.
3. Set the slide onto the frame rails and push it rearward until it seats fully.
4. Rotate the disassembly latch upward until it clicks and the release button pops back out.
   Warning: If the latch is not fully rotated up, the slide can come off under recoil.
5. Rack the slide several times and perform the function check.

5. Torque

No manufacturer torque values are recorded for this firearm.

Fit or check on rebuild

• Disassembly latch fully rotated up — A latch not fully rotated up lets the slide come off while shooting
• Magazine release captured — The manual has the tech try to pull the button out to confirm the internal pin engaged
• Full function check (trigger reset, safeties, slide lock-back, drop of striker/hammer only on trigger) — Standard after any fire-control strip; confirms springs and sears went back correctly

6. Function check

• Verify the pistol is unloaded with no magazine inserted before each check.
• With the hammer down, press the trigger for a double-action hammer fall.
• Cock the hammer and operate the decocking lever. The hammer should fall safely without the firing pin being struck.
• Rack the slide and press the trigger for a single-action break.
• Hold the trigger back, rack the slide, release slowly and confirm the reset.
• Confirm the slide locks open on an empty magazine and the magazine drops free.

If any check fails, the firearm is not safe to fire. Stop and see a licensed gunsmith.

Sources

1. Beretta PX4 Storm Pistol Owner’s Manual — Fabbrica d’Armi Pietro Beretta primary
2. Beretta Px4 Storm Pistol Owner's Manual (C62009 003) — Specifications and Technical Data — Beretta U.S.A. Corp. primary
   https://dam.beretta.com/content/dam/beretta-usa/user-manuals/PX4_Storm_Manual.pdf
3. Beretta PX4 Storm exploded view and spare parts list (Beretta Web, unofficial Beretta site by Ugo Muffolini) — berettaweb.com secondary
   https://berettaweb.com/sezionati/sez%20PX4%20STORM.htm

Educational guide only. Some information comes from non-authoritative sources. Always consult your manufacturer's manual and a licensed gunsmith. Verify your firearm is unloaded before every procedure. Full disclaimer: https://github.com/Fundamental-build-LLC/Pew-Takedown

Legal notice: this material is third-party information compiled from sources of varying reliability and is provided for general informational and educational purposes only. It is not gunsmithing, technical, safety or legal advice, it is not verified or endorsed by any manufacturer, and it must not be taken as fact. Any work on a firearm beyond the routine field stripping described in its own owner's manual should be performed only by a licensed and insured gunsmith. You use this material entirely at your own risk. Fundamental Build LLC and the project's contributors make no warranty of any kind and accept no liability for death, injury, damage or loss arising from its use. Full terms: LEGAL.md.