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Work order — SIG Sauer P220

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

56 item numbers in SIG's P220 list. Classic SIG lockwork is open and mostly push-pins, but the sear has to be held in place (grease and a swab) while the sear/safety-lever pin goes in, the hammer strut and reset spring must sit right, and the trigger bar spring bends when the grips go back on. 56 parts (SIG's P220 Parts List (2001 SIGARMS owner's manual), complete pistol incl. magazine; grip screws/washers are single rows though four are fitted.). Pew-Takedown's rating, not the manufacturer's.

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

Special tools:

• old credit card / thin plastic shim — Protecting the trigger bar spring while grips go on
• grease and cotton swab — Holding the sear while its pivot pin goes in
• dovetail sight pusher (or brass drift and padded vise) — Removing and refitting dovetailed sights for coating

Watch for:

• The trigger bar spring sits under the grip and gets knocked out of place or bent whenever the grips come off and go back on; a card over it is the usual fix. (reassembly; SIGforum)
• Rebuilding the lockwork means holding the sear in place while its pin goes through, and juggling the locking insert cross piece; parts go back by feel into a small space. (reassembly; SIGforum)
• The sear/safety-lever pin has to be pushed only part way so the safety lever can be slid in, and a hammer strut riding on the hammer pin instead of its seat stops the rebuild. (reassembly; SIGforum)
• SIG restricts disassembly past the manual to its armorers or a professional gunsmith. (both; SIG SAUER, Inc.)

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 and leave the slide locked to the rear.
2. Rotate the takedown lever downward until it stops.
   Tip: If it resists, the slide is not fully locked back.
3. Hold the slide, release the slide catch lever, and ease the slide forward off the frame.
   Warning: Control the slide rather than letting it fly forward.
4. Lift the recoil spring and guide rod out of the inverted slide.
5. Lift the barrel up and out of the slide.

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. Drop the barrel into the inverted slide and seat it fully forward.
2. Seat the recoil spring and guide rod into the cut in the barrel lug and lay the spring into its channel.
3. Set the slide onto the frame rails and push it rearward until the slide catch lever can lock it open.
4. With the slide locked open, rotate the takedown lever back up to horizontal.
   Warning: Confirm the lever is fully horizontal before the pistol goes back into service.
5. Release the slide and perform the function check.

5. Torque

Reported by other sources — not the manufacturer

Notes: The manufacturer's documents give no torque value. They say: "Verify the front and rear sights are secure." (Classic Line Pistols Operator's Manual, PDF p. 74 (function check)) "It is recommended that screw tightness be verified after firing the 1st 50 rounds, and again after each shooting session, to ensure proper function, accuracy and safety." (ROMEO1 Handgun Adapter Pack and Handgun Mounting Kit Instructions (P/N 7400612-01 R02), PDF p. 1)

Fit or check on rebuild

• Hammer type matches the action (DA/SA vs DAO) — SIG warns a standard hammer must not go in a DAO pistol
• Trigger bar spring not bent — A bent spring is hard to see and leaves a trigger that will not return
• Function check: trigger reset, sear/striker engagement, safeties — Standard post-reassembly check on any pistol whose fire-control parts were removed; a mis-seated spring shows up here, not on the bench

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. SIG Sauer Pistol Operator’s Manual — SIG Sauer, Inc. primary
2. ROMEO1 Handgun Adapter Pack and Handgun Mounting Kit Instructions (P/N 7400612-01 R02) — SIG SAUER Electro-Optics (SIG SAUER, Inc.) primary
   https://www.sigsauer.com/media/sigsauer/resources/21SIG3370_ROMEO1_HandgunAdapterInstructions_7400612-01_R02.pdf
3. Classic Line Pistols Operator's Manual — SIG SAUER, Inc. primary
   https://www.sigsauer.com/media/sigsauer/resources/OPERATORS_MANUAL_CLASSIC_LINE_PISTOLS_ENGLISH_1204276-01_REV00_LR.pdf
4. SIG SAUER 2021 Guide Price List (item descriptions) — SIG SAUER, Inc. primary
   https://www.sigsauer.com/media/sigsauer/resources/2021-Guide-Price-List-11-8.pdf
5. SIG SAUER, Inc. — SIG ClassicMiniManual 8501154Rev03 LR — SIG SAUER, Inc. primary
   https://www.sigsauer.com/media/sigsauer/resources/SIG_ClassicMiniManual_8501154Rev03_LR.pdf
6. Trijicon RMR / SRO, Holosun 407c / 507c Mount for Sig Sauer P220, P226, P229, P320 (EGW product page, installation instructions section) — Evolution Gun Works (EGW) secondary
   https://egwguns.com/trijicon-rmr-sro-holosun-407c-507c-mount-for-sig-sauer-p220-p226-p229-p320
7. SIG Sauer P220 P226 P229 P320 Red Dot Mount | Fits Vortex Venom, Viper & Burris FastFire | EGW (EGW product page, installation instructions section) — Evolution Gun Works (EGW) secondary
   https://egwguns.com/vortex-viper-venom-sig-sauer-p220-p226-p229-p320-sight-mount-fits-burris-fastfire-and-docter
8. SIG SAUER Pistol Owner's Manual, Models P220 P225 P226 P228 P229 P239 P245 (SIGARMS, 2001; copy hosted by J&G Sales) — SIGARMS Inc. primary
   https://www.jgsales.com/wp-content/uploads/SIG_Autos_in_general.pdf
9. P226 Trigger Sticks - Topic — SIGforum anecdotal
   https://sigforum.com/eve/forums/a/tpc/f/150601935/m/5940003644
10. Sigs vs HK's - Topic — SIGforum anecdotal
    https://sigforum.com/eve/forums/a/tpc/f/430601935/m/6900042305
11. P220 locking insert removal help-Update - Topic — SIGforum anecdotal
    https://sigforum.com/eve/forums/a/tpc/f/150601935/m/6270099424

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.