Glock parts by generation: a cross-reference guide

Every part listing on this site names the generation it fits, and this page is the key behind those listings. Glock changed its pistols five times since 1982, and each change moved some parts and left others alone. Read down the list for the part you need, and the entry tells you which pistols it fits and what to check before ordering. Standard-frame 9mm pistols are the baseline; the .40 family, the large-frame 10mm and .45 and the slimline models are noted where they differ.

Parts that fit every generation

Sights: the same dovetail and front hole on every Glock slide of a given width. Standard sights fit Gen 1 through Gen 5; slimline sights fit the 42, 43, 43X and 48.
Magazines: every magazine of a caliber family fits every generation of that family. Gen 4 and later magazines have a notch on both sides for the reversible catch; older single-notch magazines work in Gen 4 and Gen 5 pistols with the catch in the right-hand position.
Connector: fits every generation. Glock sells a Gen 5 version; earlier connectors also work in a Gen 5 housing.
Trigger spring: the coil spring is shared through Gen 5, though it hooks to a different bar on Gen 5.

Parts shared by Gen 1 through Gen 4

Slides and barrels: Gen 1 to Gen 4 interchange within a model, with the recoil assembly matched to the slide. Gen 5 slides and barrels are their own pattern.
Trigger bar, trigger housing with ejector, firing pin, firing pin safety, spring cups, extractor, slide stop lever: shared through Gen 4 within a caliber. The extractor comes in a plain early form and the LCI form; the bearing behind it must match.
Slide lock, slide lock spring, trigger pin, slide cover plate, channel liner: shared through Gen 4.
Locking block: shared by three-pin frames, Gen 2 after about 1990 through Gen 4. Gen 1 two-pin frames use their own.

Parts that changed at Gen 4

Recoil spring assembly: Gen 1 to 3 use a single spring on a polymer rod; Gen 4 uses a dual captured assembly and a slide with a larger tunnel. Not interchangeable without an adapter.
Magazine catch and spring: small on Gen 1 to 3, large and reversible on Gen 4.
Backstraps and trigger housing pin: Gen 4 introduced backstraps and a longer housing pin to fit them.
Grip texture and frame outline: cosmetic, but a few tight holster molds are generation specific.

Parts that changed at Gen 5

Everything in the fire-control group: trigger bar, trigger housing with the 47021 ejector for 9mm, firing pin safety and its cut in the striker, striker and cups, connector by design.
Slide and barrel: beveled nose, new locking block engagement, ambidextrous slide stop cut, Marksman Barrel.
Frame parts: two-pin frame with its own locking block, ambidextrous slide stop lever, coil slide lock spring, a different reversible magazine catch, Gen 5 backstraps.
Recoil spring assembly: a revised dual assembly, not interchangeable with Gen 4.
Extractor: a Gen 5 part.
Magazines: orange follower and lipped floorplate, backward compatible.

The .40 S&W and .357 SIG family

Same frame as 9mm, so the frame parts cross; the barrel, extractor, ejector housing and magazines are caliber specific, and the .40 and .357 SIG share them. A 9mm conversion barrel with 9mm magazines runs 9mm in a .40 pistol; the reverse does not exist.

The 10mm and .45 ACP large frame

A wider frame with its own slide, barrel, locking block, extractor, ejector housing, magazine catch, trigger bar and magazines; the connector, trigger spring, sights and most small springs are shared with the standard frame. Gen 4 and Gen 5 large-frame pistols follow the same generation rules as the 9mm.

The slimline 42, 43, 43X and 48

A separate family. Slides, barrels, strikers, extractors, trigger bars, housings, recoil assemblies, magazines and sights are all slimline parts; the 43X and 48 share magazines and most parts, the 43 and the .380 42 have their own. Standard-frame parts do not fit, and the connector is the one part in common.

The Glock 44

The .22 LR 44 has a hybrid slide and its own striker, extractor and magazines; its frame is the 19 outline and takes Gen 5 frame parts.

Reading the generation off the pistol

Gen 4 and Gen 5 pistols say so on the slide, after the model number. Earlier pistols are identified by the frame: a Gen 1 has a pebbled grip with no finger grooves and two pins above the trigger; a Gen 2 has checkering on the front and back straps and, after about 1990, three pins; a Gen 3 has finger grooves, thumb rests and an accessory rail. The slimline pistols and the 44 carry their model numbers on the slide and have no generation mark.

How to order

Identify the model and generation from the slide mark or the frame; Gen 4 and Gen 5 are marked, earlier pistols are read from the grip and pin count.
Find the part above and note whether it crosses generations.
Match the caliber family for barrels, extractors, housings and magazines.
For the slimline and large frames, buy from their own listings.

When a listing says Gen 1 to 4, it means the standard-frame pistols of those generations in the caliber named; Gen 5 and slimline parts are always marked separately. If a part is not on this page, its listing will say which pistols it fits, and we can confirm fit from your model and generation. Keep the pistol running with the maintenance schedule and the lubrication guide, and browse Glock parts by generation; they ship to your door.

General information, not legal advice. Current as of September 2026. Laws change; check the official source before you act.