Boito Miura II
- Category
- Shotgun
- Barrel
- 760 mm
- Weight, empty
- 3.40 kg
- Introduced
- Not recorded
About
What it is, and why it matters
The Boito Miura II is a break-action over-under (superimposed barrel) double-barreled shotgun manufactured in Brazil by E.R. Amantino & Cia (Boito). Marketed as the first over-under shotgun produced in Brazil, it feeds two rounds in stacked barrels fired by twin triggers, and is offered in 12, 20, 28 and 36 gauge with interchangeable chokes and a hardwood stock. It is a popular and affordable hunting and sport shotgun in the Brazilian market.
The Miura II earned its place in Brazilian gun lore as the country's first domestically manufactured over-under shotgun, a milestone for Boito, one of Brazil's oldest firearms makers founded in 1955.
Barrel lengths vary by gauge (508-760 mm). The 12, 20 and 36 gauge models use a 76 mm (3 inch) chamber, while the 28 gauge uses a 70 mm chamber. Offered in standard oxidized, Luxo (nickeled receiver) and Super Luxo (nickeled and engraved) finishes; 12 gauge is also available with synthetic black or camouflage stocks.
Specification
Everything measured
IdentityWhat it is, who built it and when.
- Manufacturer
- E.R. Amantino & Cia Ltda (Boito)
- Category
- Shotgun
- Country
- Brazil
- Status
- In production
DimensionsAs issued, without a magazine or an optic.
- Barrel
- 760 mm
- Overall length
- 1190 mm
- Weight, empty
- 3.40 kg
ActionHow it cycles, what trips it, and what feeds it.
- Action
- Break action
- Firing mechanism
- Internal hammer
- Trigger
- Single stage
- Capacity
- 2
MaterialsEach swatch is the material itself, not a colour chosen to stand for it.
- Frame
- Steel
- Barrel
- Steel
- Stock
- Wood
- Finish
- Oxidized
BallisticsFrom the service cartridge, not a handload.
- Muzzle velocity
- 400 m/s
- Muzzle energy
- 2560 J
- 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.
Over under barrels
Double trigger
Interchangeable chokes
Recoil pad
Hardwood 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 | 1190 mm | 1150 mm | Longer than about 70% |
| Barrel lengthAmong 650 12 Gauge shotguns | 760 mm | 711 mm | Longer than about 80% |
| Magazine capacityAmong 647 12 Gauge shotguns | 2 | 3 | Holds fewer rounds than about 70% |
Answers
Questions about the Boito Miura II
How much does the Boito Miura II weigh?
The Boito Miura II weighs 3.40 kg (7.50 lb) empty.
What caliber is the Boito Miura II?
The Boito Miura II is chambered in 12 Gauge, 20 Gauge, and 28 Gauge.
How many rounds does the Boito Miura II hold?
The Boito Miura II holds 2 rounds.
How long is the Boito Miura II?
The Boito Miura II is 1190 mm (46.9 in) long overall, with a 760 mm (29.9 in) barrel.
Who makes the Boito Miura II?
The Boito Miura II is made by E.R. Amantino & Cia Ltda (Boito) (Brazil).
How does the Boito Miura II operate?
The Boito Miura II uses a break action, and its firing mechanism is internal hammer.
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/boito-miura-ii' \ --header 'X-API-Key: your_key'{ "id": "boito-miura-ii", "name": "Boito Miura II", "manufacturer": { "id": "boito", "name": "E.R. Amantino & Cia Ltda (Boito)", "countryCode": "BR", "foundedYear": 1955, "website": "https://www.boito.com.br", "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": "fbb9f03d225297c630fcf70abc90b135ca12894e984b7a7f6ab0a507ae0453d8" }, "category": { "id": "shotgun", "name": "Shotgun", "description": "Smoothbore firearms designed to fire shot or slugs" }, "country_of_origin": "BR", "year_introduced": null, "barrel_length_mm": 760, "weight_empty_g": 3400, "action_type": "break_action"}