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Beretta PX4 Storm

• easy
• Shop tier 2
• medium confidence
• Pistol
• rotating barrel
• da sa
• decocker
• polymer frame

field strip ~1 min · reassembly ~2 min · detail strip ~25 min

Specifications

Model-specific safety

• The PX4 uses a rotating barrel rather than a tilting barrel. The barrel rotates on a central lug during the cycle, which means it comes out of the slide differently from a Browning-pattern pistol — do not force it straight up.
• The recoil spring assembly is under tension when the slide is off.
• The safety/decocking lever drops the hammer when rotated. Never use it in place of verifying an empty chamber.
• The Subcompact model uses a tilting-barrel action rather than the rotating barrel of the Full Size and Compact. Confirm which you have.

Under spring tension

• Recoil spring assembly
• Magazine spring

Easily lost parts

Disassembly latch · Recoil spring assembly · Rotating barrel cam block

Tools

No tools required for the field strip.

Shop difficulty

Shop tier 2 Tier 2 — moderate among pistols, for the full job: strip to the parts that get coated and put it back together working. 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.

Parts: 67 numbered 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), from Beretta PX4 Storm exploded view and spare parts list (Beretta Web, unofficial Beretta site by Ugo Muffolini) — berettaweb.com berettaweb.com [3].

Bench time: about 30 min to strip, 45 min to rebuild (estimate). Estimate for an experienced tech with the right tools, detail strip to coatable parts (slide internals, frame pins, trigger group, sights) and rebuild to a function-checked gun; scale used across pistols: Glock-pattern 15/20 min, other strikers 20-30/25-40, DA/SA hammer guns 30-35/45-50, Hi-Power, Colt 1903 and Mark 23 40-45/60-75. No parts list;

Small parts: 10 pins, 17 springs, 1 detents or plungers (counted by name in the same parts table (one per key number): pins = 006 elastic pin 3x12, 014 elastic pin 2x10, 027 lever assembly pin, 028 sear pin, 031 hammer pin, 036 elastic pin 1,5x5, 041 trigge)

What comes off for coating

• Slide: safety/decocker (F model), firing pin and firing pin block, extractor, sights
• Barrel: rotating barrel, central block, recoil spring and guide
• Frame: hammer unit (hammer mechanism group), trigger and trigger bar, slide catch, disassembly latch, magazine release button, spring and pin, backstrap and U-spring — drift punch, flat screwdriver

Special tools

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

Known pain points

• Beretta restricts everything past the field strip to a competent gunsmith. (both)
  Source: Beretta Px4 Storm Pistol Owner's Manual (C62009 003) — Specifications and Technical Data — Beretta U.S.A. Corp. dam.beretta.com [2] — “CAUTION: No further disassembly is recommended unless done by a competent gunsmith.”
• The hammer mechanism is a separate unit that comes out without special tools, but Beretta still classes its removal as gunsmith work. (both)
  Source: Beretta Px4 Storm Pistol Owner's Manual (C62009 003) — Specifications and Technical Data — Beretta U.S.A. Corp. dam.beretta.com [2] — “When necessary, the hammer mechanism can even be removed in the field by qualified personnel. WARNING: This operation must be carried out by a competent gunsmith.”
• 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)
  Source: Beretta Px4 Storm Pistol Owner's Manual (C62009 003) — Specifications and Technical Data — Beretta U.S.A. Corp. dam.beretta.com [2] — “Keep it in place with one finger and at the same time, firmly push on the head of the internal pin (opposite side of the button) so that it will engage the button.”

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
  Source: Beretta Px4 Storm Pistol Owner's Manual (C62009 003) — Specifications and Technical Data — Beretta U.S.A. Corp. dam.beretta.com [2] — “Try to remove the button from its seat to check that it is properly fixed.”
• 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

This is Pew-Takedown's rating, not the manufacturer's. How tiers are rated. Forum reports are owners' experience, not specifications.

Procedures

Torque specifications

No sourced torque values from the manufacturer are recorded for this firearm. Where a fastener has a specified torque — action screws, scope bases, muzzle devices, barrel nuts — get it from the manufacturer or a gunsmith rather than estimating it.

Materials and factory finish

As stated by Beretta. Prep, masking and cure depend on these; a polymer or aluminium part, a nitrided or anodised finish, and a blued steel part are each a different job. Variants with other finishes may exist — check the maker's page for the exact SKU on the bench.

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.

Maintenance

Lubrication points

• Frame rails and slide grooves
• Rotating barrel cam surfaces and the central lug
• Outside of the barrel
• Hammer and sear pivots

Cleaning notes

Pay particular attention to the rotating barrel cam surfaces — that interface does the locking work on this design and fouling there is felt directly in how the action cycles.

Suggested inspection interval: roughly every 5000 rounds. This is a general guideline, not a manufacturer specification.

Wear parts to inspect

Recoil spring assembly · Rotating cam block · Extractor · Locking block area

Common issues

Also covers

The procedures above are reported to apply to: PX4 Storm Full Size · PX4 Storm Compact. Verify against the manual for your specific model.

Similar manual of arms

• Beretta 92FS

Sourcing