← All firearms · Printable work order

SIG Sauer P220

• easy
• Shop tier 2
• medium confidence
• Pistol
• da sa
• decocker
• alloy frame
• toolless field strip

field strip ~1 min · reassembly ~2 min · detail strip ~30 min

Specifications

Model-specific safety

• The takedown lever will not rotate unless the slide is locked to the rear. Do not force it.
• The recoil spring and guide rod are under tension when the slide is removed.
• Use the decocking lever to lower the hammer. Never lower a hammer by hand over a chamber you have not verified empty.
• Keep fingers clear of the slide path when releasing it from the locked-open position.

Under spring tension

• Recoil spring and guide rod
• Mainspring (detail strip)

Easily lost parts

Takedown lever · Recoil spring guide rod

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. 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.

Parts: 56 numbered 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.), from SIG SAUER Pistol Owner's Manual, Models P220 P225 P226 P228 P229 P239 P245 (SIGARMS, 2001; copy hosted by J&G Sales) — SIGARMS Inc., PDF p. 27 jgsales.com [8].

Bench time: about 30 min to strip, 45 min to rebuild (estimate). Slide (firing pin and safety lock, extractor, breech block or pin bolts, sights) and frame (grips, trigger bar spring, decocker, hammer/strut/mainspring, sear and safety lever, reset spring, slide catch, mag catch, locking insert); rebuild longer for the sear pin and hammer strut.

Small parts: 10 pins, 12 springs, 1 detents or plungers (counted from SIG's P220 parts list (pins: 7, 8, 21, 26, 27, 30, 31, 35A, 39, 57A; safety lock as plunger))

What comes off for coating

• Slide: firing pin, spring and safety lock (firing pin block) and spring, extractor (and spring/bolt on stainless slides), breech block roll pins or firing-pin bolt, rear sight, front sight — roll-pin punches, sight pusher
• Frame: grips (protect trigger bar spring), slide catch lever and spring, takedown lever, trigger, pivot and trigger bar, decocking lever, bearing and spring, hammer, strut, mainspring and seat, sear, sear spring and safety lever on their pivot, reset spring and hammer stop, locking insert, magazine catch, stop and springs — pin punches, pick

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

Known pain points

• 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)
  Owners report: P226 Trigger Sticks - Topic — SIGforum sigforum.com [9] — “When the Grip is taken off and put back on the trigger bar spring gets knocked loose or out of place sometimes. When reinstalling that spring it is best to place an old credit card over the spring and slip the card out when the grip is on.”
• 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)
  Owners report: Sigs vs HK's - Topic — SIGforum sigforum.com [10] — “But other than doing things like holding the sear in place with a cotton swab and some grease on it, or manipulating the cross piece with a small screw driver when reinstalling a locking block, they're pretty easy - and OPEN.”
• 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)
  Owners report: P220 locking insert removal help-Update - Topic — SIGforum sigforum.com [11] — “You will need to slide the sear pin to the left just enough that the pin is holding the sear but will let you slide the lever in place.”
• SIG restricts disassembly past the manual to its armorers or a professional gunsmith. (both)
  Source: Classic Line Pistols Operator's Manual — SIG SAUER, Inc. sigsauer.com [3] — “Disassembly beyond the instructions in this manual is restricted to a certified SIG SAUER armorer or professional gunsmith.”

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
  Source: SIG SAUER Pistol Owner's Manual, Models P220 P225 P226 P228 P229 P239 P245 (SIGARMS, 2001; copy hosted by J&G Sales) — SIGARMS Inc. jgsales.com [8] — “Never install a standard hammer 29 in a DAO pistol.”
• Trigger bar spring not bent — A bent spring is hard to see and leaves a trigger that will not return
  Source: P226 Trigger Sticks - Topic — SIGforum sigforum.com [9] — “It's insidious, because the bending of the spring is not readily apparent to the eye.”
• 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

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

Manufacturer videos

Official videos from SIG Sauer's own channels, linked rather than copied. Where a video and the steps on this page differ, follow the manufacturer's manual and video.

• Cleaning Your SIG SAUER Classic Line Pistol SIG SAUER Academy cleaning, maintenance · 2015-06-08
  Covers: SIG SAUER Classic Line pistols (per the title). SIG's current Classic Line operator's manual covers the P220, P226 and P229.

Procedures

Torque specifications

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)

Reported by other sources — not the manufacturer

Materials and factory finish

As stated by SIG Sauer. 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
• Barrel locking lug and hood
• Outside of the barrel at the muzzle
• Hammer and sear pivots
• Takedown lever pivot

Cleaning notes

Alloy-frame SIGs use steel rail inserts. Keep them lightly oiled and free of grit. Keep the firing pin channel dry.

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

Wear parts to inspect

Recoil spring · Extractor · Roll pins in the slide · Decocking lever spring

Common issues

Similar manual of arms

• SIG Sauer P226

Sourcing