Hämmerli AP20 Pro
- Category
- Pistol
- Barrel
- 250 mm
- Weight, empty
- 980 g
- Introduced
- 2023
About
What it is, and why it matters
The Hämmerli AP20 Pro is a single-shot 10-metre match air pistol chambered in .177 (4.5mm) and powered by a 200 bar pre-charged pneumatic system. The Pro is the premium tier of the AP20 line, fitting a 3D-adjustable walnut competition grip, an aluminum cylinder with pressure gauge good for roughly 150 shots per charge, a fine two-stage mechanical match trigger, and fully adjustable open sights with a rotatable front element. It is built for ISSF Olympic and ISSF-style 10 m air pistol competition.
The Hämmerli name has been synonymous with precision target shooting since 1863, supplying Olympic and world-championship pistols for over a century. The AP20 Pro continues that lineage as a modern entry-to-mid level 10 m match air pistol, giving competitive ISSF shooters an adjustable, low-recoil training and match platform.
The AP20 family is engineered and produced by Carl Walther GmbH in Germany under the Swiss-heritage Hämmerli brand. The standard AP20 launched in 2022, with the Pro variant adding the adjustable walnut grip and competition refinements.
Specification
Everything measured
IdentityWhat it is, who built it and when.
- Manufacturer
- Hämmerli
- Category
- Pistol
- Country
- Germany
- Status
- In production
- Produced
- 2023
- Variant of
- Premium competition model
DimensionsAs issued, without a magazine or an optic.
- Barrel
- 250 mm
- Overall length
- 415 mm
- Height
- 170 mm
- Width
- 50 mm
- Sight radius
- 370 mm
- Weight, empty
- 980 g
ActionHow it cycles, what trips it, and what feeds it.
- Action
- Single action
- Firing mechanism
- Striker fired
- Trigger
- Single action
- Trigger pull
- 5.0 N
- Capacity
- 1
- Magazine
- Internal
MaterialsEach swatch is the material itself, not a colour chosen to stand for it.
- Frame
- Aluminum alloy
- Barrel
- Steel
- Stock
- Walnut
- Finish
- Anodized aluminum
BallisticsFrom the service cartridge, not a handload.
- Muzzle velocity
- 150 m/s
- Muzzle energy
- 8 J
- Effective range
- 10 m
- Maximum range
- 25 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.
200 bar pre-charged pneumatic air system
Aluminum cylinder with pressure gauge- Two-stage adjustable mechanical trigger (~500 g)
- Approximately 150 shots per air charge
Fully adjustable open match sights- Rotatable front sight (4.2 / 4.8 / 5.2 mm widths)
Adjustable 3D walnut grip in left- and right-hand options
Interchangeable colored barrel jackets
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 Hämmerli AP20 Pro
How much does the Hämmerli AP20 Pro weigh?
The Hämmerli AP20 Pro weighs 980 g (2.16 lb) empty.
What caliber is the Hämmerli AP20 Pro?
The Hämmerli AP20 Pro is chambered in .177 Air (4.5mm).
How many rounds does the Hämmerli AP20 Pro hold?
The Hämmerli AP20 Pro holds 1 rounds, fed from an internal magazine.
How long is the Hämmerli AP20 Pro?
The Hämmerli AP20 Pro is 415 mm (16.3 in) long overall, with a 250 mm (9.84 in) barrel.
Who makes the Hämmerli AP20 Pro?
The Hämmerli AP20 Pro is made by Hämmerli (Switzerland). It was designed by Carl Walther GmbH.
When was the Hämmerli AP20 Pro introduced?
The Hämmerli AP20 Pro was introduced in 2023.
How does the Hämmerli AP20 Pro operate?
The Hämmerli AP20 Pro uses a single 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
85%
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-pro' \ --header 'X-API-Key: your_key'{ "id": "hammerli-ap20-pro", "name": "Hämmerli AP20 Pro", "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": 2023, "barrel_length_mm": 250, "weight_empty_g": 980, "action_type": "single_action"}