Glock 20 Gen4
- Category
- Pistol
- Barrel
- 117 mm
- Weight, empty
- 780 g
- Introduced
- 1990
About
What it is, and why it matters
The Glock 20 is a full-size, striker-fired pistol chambered in the powerful 10mm Auto cartridge, introduced in 1990. It pairs Glock's proven Safe Action system and polymer frame with a large-frame slide sized to handle the high-energy 10mm round, making it a favorite for hunting, backcountry defense against large animals, and shooters who want maximum power in a service-size handgun. The Gen4 adds a reversible magazine catch, the Modular Backstrap System, and a rough-textured frame.
The 10mm Auto Glock 20 found a strong following among outdoorsmen and hunters as a lightweight alternative to a revolver for defense against bears and other large game.
Standard magazine holds 15 rounds of 10mm Auto. Popular as a trail and hunting sidearm thanks to the cartridge's high muzzle energy.
Specification
Everything measured
IdentityWhat it is, who built it and when.
- Manufacturer
- Glock Ges.m.b.H.
- Category
- Pistol
- Country
- Austria
- Status
- In production
- Produced
- 1990
DimensionsAs issued, without a magazine or an optic.
- Barrel
- 117 mm
- Overall length
- 205 mm
- Height
- 140 mm
- Width
- 33 mm
- Sight radius
- 172 mm
- Weight, empty
- 780 g
- Weight, loaded
- 870 g
ActionHow it cycles, what trips it, and what feeds it.
- Action
- Short recoil
- Firing mechanism
- Striker fired
- Trigger
- Safe action
- Trigger pull
- 27.0 N
- Capacity
- 15
- Magazine
- Detachable box
MaterialsEach swatch is the material itself, not a colour chosen to stand for it.
- Frame
- Polymer
- Slide
- Steel
- Barrel
- Steel
- Finish
- NDLC
BallisticsFrom the service cartridge, not a handload.
- Muzzle velocity
- 375 m/s
- Muzzle energy
- 820 J
- Effective range
- 50 m
Trajectory
What the round does downrange
Solved from the muzzle figures and the bullet. The dashed rule is the effective range on the record, and the crosses are the steps the solver returned.
Features
What it has
What the record lists as fitted, drawn from the catalogue.
Accessory rail
Ambidextrous slide stop
Reversible mag release
Interchangeable backstraps
Rough textured frame
Standing
How it compares
Each figure against the firearms of the same type and cartridge that record it, or of the same type where that cartridge has too few. Positions are read to the nearest tenth.
| Measurement | This firearm | Median | Position |
|---|---|---|---|
| Empty weightAmong 31 10mm Auto pistols | 780 g | 936 g | Lighter than about 70% |
| Overall lengthAmong 30 10mm Auto pistols | 205 mm | 204 mm | Longer than about 60% |
| Barrel lengthAmong 31 10mm Auto pistols | 117 mm | 117 mm | Longer than about 60% |
| Magazine capacityAmong 31 10mm Auto pistols | 15 | 10 | Holds more rounds than about 80% |
Its place in the rankings
Answers
Questions about the Glock 20 Gen4
How much does the Glock 20 Gen4 weigh?
The Glock 20 Gen4 weighs 780 g (1.72 lb) empty and 870 g (1.92 lb) loaded. It is the 10th lightest of 31 10mm Auto pistols in the catalogue.
What caliber is the Glock 20 Gen4?
The Glock 20 Gen4 is chambered in 10mm Auto.
How many rounds does the Glock 20 Gen4 hold?
The Glock 20 Gen4 holds 15 rounds, fed from a detachable box magazine.
How long is the Glock 20 Gen4?
The Glock 20 Gen4 is 205 mm (8.07 in) long overall, with a 117 mm (4.61 in) barrel.
Who makes the Glock 20 Gen4?
The Glock 20 Gen4 is made by Glock Ges.m.b.H. (Austria). It was designed by Gaston Glock.
When was the Glock 20 Gen4 introduced?
The Glock 20 Gen4 was introduced in 1990.
How does the Glock 20 Gen4 operate?
The Glock 20 Gen4 uses a short recoil action, and its firing mechanism is striker fired.
Compatibility
Which parts fit this firearm
Studio
Every part that mounts on this, resolved
Not a list the maker typed out: the answer comes from the mounts this firearm exposes and the interface each part needs, so it stays right when either one changes.
- Every part that mounts on any firearm in the catalogue
- Interface standards, platforms and fit overrides
- The same answers through the API and the MCP server
Requires a signed-in GunSpec account on the Studio plan. The answer is computed per part, so it is not part of the public record.
Provenance
What the record holds
Every figure above was taken from one of these pages. The confidence reflects how much of the record came from a page a claim can be checked against.
Provenance
Confidence in this record
88%
Stockists
Where to buy
Offers link straight to the shop. GunSpec never takes the order.
No shop has listed this firearm yet
Stock and prices come from the shops themselves. If you sell this firearm, you can list it and it appears here.
List a firearmMCP
Ask an assistant about it
The same record, reached the way a person asks for it rather than the way a program does.
Ask GunSpec
Works with
Point an MCP client at GunSpec and it answers from the catalogue rather than from memory. A free key covers the read tools.
API
The call that returns this record
The same fields, in the same units, from the same endpoint the page reads.
curl --request GET \ --url 'https://api.gunspec.io/v1/firearms/glock-g20' \ --header 'X-API-Key: your_key'{ "id": "glock-g20", "name": "Glock 20 Gen4", "manufacturer": { "id": "glock", "name": "Glock Ges.m.b.H.", "countryCode": "AT", "foundedYear": 1963, "website": "https://www.glock.com", "logoUrl": null, "description": null, "status": null, "defunctYear": null, "stateOwned": null, "makesFirearms": null, "parentId": null, "predecessorId": null, "createdAt": "2026-02-11 23:44:38", "updatedAt": "2026-02-18 03:43:49", "version": "3082b5f3edc3e54ca4f0993c68dba8c456b4f86e8759e3310ef604da566477d6" }, "category": { "id": "pistol", "name": "Pistol", "description": "Handguns designed to be fired with one or two hands" }, "country_of_origin": "AT", "year_introduced": 1990, "barrel_length_mm": 117, "weight_empty_g": 780, "action_type": "short_recoil"}