Hammerli AP20
- Category
- Pistol
- Barrel
- 250 mm
- Weight, empty
- 980 g
- Introduced
- 2019
About
What it is, and why it matters
The Hammerli AP20 is a single-shot pre-charged pneumatic (PCP) match air pistol chambered in .177 (4.5mm) and designed for ISSF 10-metre air pistol competition. It uses a 200 bar compressed-air cylinder with an integrated pressure gauge, delivering roughly 150 shots per fill at the regulated 7.5-joule competition energy limit. The AP20 features an adjustable two-stage match trigger, a 3D-adjustable walnut competition grip available in multiple sizes, fully adjustable target sights, and interchangeable colored barrel jackets.
Hämmerli is one of the most storied names in precision target shooting, and the AP20 continues the brand's long line of Olympic-class 10-metre air pistols under Walther ownership.
Manufactured by Hämmerli, a competition-shooting brand owned by Walther/Carl Walther GmbH. The uprated AP20 PRO adds further refinements for elite-level competitors.
Specification
Everything measured
IdentityWhat it is, who built it and when.
- Manufacturer
- Hämmerli
- Category
- Pistol
- Country
- Germany
- Status
- In production
- Produced
- 2019
DimensionsAs issued, without a magazine or an optic.
- Barrel
- 250 mm
- Overall length
- 415 mm
- Sight radius
- 370 mm
- Weight, empty
- 980 g
ActionHow it cycles, what trips it, and what feeds it.
- Action
- Single action
- Firing mechanism
- Fixed firing pin
- Trigger
- Two stage
- Trigger pull
- 4.9 N
- Capacity
- 1
MaterialsEach swatch is the material itself, not a colour chosen to stand for it.
- Frame
- Aluminum
- Barrel
- Steel
- Stock
- Walnut
- Finish
- Anodized
BallisticsFrom the service cartridge, not a handload.
- Muzzle velocity
- 150 m/s
- Muzzle energy
- 8 J
- Effective range
- 10 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.
No load solved for this record yetThe flight path is computed from a cartridge and a bullet. This record has no ammunition filed against its chambering, so there is nothing to solve.
Features
What it has
What the record lists as fitted, drawn from the catalogue.
Pre charged pneumatic
200 bar air cylinder
Integrated pressure gauge
Adjustable two stage trigger
3d adjustable walnut grip
Interchangeable colored barrel jackets
Adjustable sights
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 45 .177 Air (4.5mm) pistols | 980 g | 968 g | Heavier than about 60% |
| Overall lengthAmong 45 .177 Air (4.5mm) pistols | 415 mm | 400 mm | Longer than about 80% |
| Barrel lengthAmong 43 .177 Air (4.5mm) pistols | 250 mm | 230 mm | Longer than about 90% |
| Magazine capacityAmong 45 .177 Air (4.5mm) pistols | 1 | 1 | Near the median |
Answers
Questions about the Hammerli AP20
How much does the Hammerli AP20 weigh?
The Hammerli AP20 weighs 980 g (2.16 lb) empty.
What caliber is the Hammerli AP20?
The Hammerli AP20 is chambered in .177 Air (4.5mm).
How many rounds does the Hammerli AP20 hold?
The Hammerli AP20 holds 1 rounds.
How long is the Hammerli AP20?
The Hammerli AP20 is 415 mm (16.3 in) long overall, with a 250 mm (9.84 in) barrel.
Who makes the Hammerli AP20?
The Hammerli AP20 is made by Hämmerli (Switzerland).
When was the Hammerli AP20 introduced?
The Hammerli AP20 was introduced in 2019.
How does the Hammerli AP20 operate?
The Hammerli AP20 uses a single action, and its firing mechanism is fixed firing pin.
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.
In service
- ISSF competitive shooters
- 2019
Provenance
Confidence in this record
86%
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/hammerli-ap20' \ --header 'X-API-Key: your_key'{ "id": "hammerli-ap20", "name": "Hammerli AP20", "manufacturer": { "id": "hammerli", "name": "Hämmerli", "countryCode": "CH", "foundedYear": 1863, "website": "https://waltherarms.com", "logoUrl": null, "description": null, "status": null, "defunctYear": null, "stateOwned": null, "makesFirearms": null, "parentId": null, "predecessorId": null, "createdAt": "2026-02-18 03:40:45", "updatedAt": "2026-02-18 03:40:45", "version": "e1209cd056d8e246d5f5bd05c752faecd47fbc79eba9c411b20e724db5ca3e62" }, "category": { "id": "pistol", "name": "Pistol", "description": "Handguns designed to be fired with one or two hands" }, "country_of_origin": "DE", "year_introduced": 2019, "barrel_length_mm": 250, "weight_empty_g": 980, "action_type": "single_action"}