Arrieta 803
- Category
- Shotgun
- Barrel
- 711 mm
- Weight, empty
- 3.40 kg
- Introduced
- Not recorded
About
What it is, and why it matters
The Arrieta 803 is a Spanish side-by-side double-barreled shotgun built on a reinforced nine-pin Holland & Holland-pattern sidelock action with hand-detachable lock plates. Hand-built in Elgoibar in the Basque Country, it features chopper-lump steel barrels, automatic ejectors, double triggers, gold-inlaid cocking indicators, a case-hardened and engraved action, and a hand-finished walnut stock. It is offered as a bespoke game gun across 12, 16, 20, 28 gauge and .410 bore.
Arrieta was founded in 1916 in Elgoibar, in the Basque gunmaking region of Spain, and built its reputation on traditional sidelock side-by-side game guns in the English style, exported worldwide to driven-game and upland shooters.
A best-quality boxlock/sidelock game gun made to order with customer-specified barrel length, chokes, stock dimensions and engraving; individual specifications vary by commission.
Specification
Everything measured
IdentityWhat it is, who built it and when.
- Manufacturer
- Arrieta S.L.
- Category
- Shotgun
- Country
- Spain
- Status
- In production
DimensionsAs issued, without a magazine or an optic.
- Barrel
- 711 mm
- Overall length
- 1143 mm
- Weight, empty
- 3.40 kg
ActionHow it cycles, what trips it, and what feeds it.
- Action
- Break action
- Firing mechanism
- Hammer fired
- Trigger
- Double trigger
- Capacity
- 2
MaterialsEach swatch is the material itself, not a colour chosen to stand for it.
- Frame
- Steel
- Barrel
- Steel
- Stock
- Walnut
- Finish
- Case hardened
BallisticsFrom the service cartridge, not a handload.
- Muzzle velocity
- 400 m/s
- Effective range
- 40 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.
Sidelock action
Hand detachable locks
Automatic ejectors
Chopper lump barrels
Double triggers
Engraved action
Straight english stock
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 622 12 Gauge shotguns | 3.40 kg | 3.29 kg | Heavier than about 60% |
| Overall lengthAmong 570 12 Gauge shotguns | 1143 mm | 1150 mm | Shorter than about 60% |
| Barrel lengthAmong 650 12 Gauge shotguns | 711 mm | 711 mm | Longer than about 60% |
| Magazine capacityAmong 647 12 Gauge shotguns | 2 | 3 | Holds fewer rounds than about 70% |
Answers
Questions about the Arrieta 803
How much does the Arrieta 803 weigh?
The Arrieta 803 weighs 3.40 kg (7.50 lb) empty.
What caliber is the Arrieta 803?
The Arrieta 803 is chambered in 12 Gauge.
How many rounds does the Arrieta 803 hold?
The Arrieta 803 holds 2 rounds.
How long is the Arrieta 803?
The Arrieta 803 is 1143 mm (45.0 in) long overall, with a 711 mm (28.0 in) barrel.
Who makes the Arrieta 803?
The Arrieta 803 is made by Arrieta S.L. (Spain).
How does the Arrieta 803 operate?
The Arrieta 803 uses a break action, and its firing mechanism is hammer 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
72%
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/arrieta-803' \ --header 'X-API-Key: your_key'{ "id": "arrieta-803", "name": "Arrieta 803", "manufacturer": { "id": "arrieta", "name": "Arrieta S.L.", "countryCode": "ES", "foundedYear": 1916, "website": "https://www.arrieta.es", "logoUrl": null, "description": null, "status": null, "defunctYear": null, "stateOwned": null, "makesFirearms": null, "parentId": null, "predecessorId": null, "createdAt": "2026-07-06 11:00:16", "updatedAt": "2026-07-06 11:00:16", "version": "b29be1a9a8e16e5cf5774afba60bbcce9c013ed845fd4681f88338779e3906d0" }, "category": { "id": "shotgun", "name": "Shotgun", "description": "Smoothbore firearms designed to fire shot or slugs" }, "country_of_origin": "ES", "year_introduced": null, "barrel_length_mm": 711, "weight_empty_g": 3400, "action_type": "break_action"}