Lithgow F90 MBR
- Category
- Assault Rifle
- Barrel
- 407 mm
- Weight, empty
- 3.25 kg
- Introduced
- 2020
About
What it is, and why it matters
The Lithgow F90 MBR (Modular Bullpup Rifle) is an enhanced variant of the F90 designed for integrated forces. It features improved ambidextrous controls, a drop-free magazine release with flared magazine well, and OTB (Over-The-Beach) US SOCOM compliance for amphibious operations. The MBR retains all F90 barrel length options while adding modernized ergonomics.
OTB US SOCOM compliant. Compatible with 40mm grenade launcher. Rate of fire: 740 RPM.
Specification
Everything measured
IdentityWhat it is, who built it and when.
- Manufacturer
- Lithgow Arms
- Category
- Assault Rifle
- Country
- Australia
- Status
- In production
- Produced
- 2020
- Variant of
- Modular
DimensionsAs issued, without a magazine or an optic.
- Barrel
- 407 mm
- Overall length
- 701 mm
- Weight, empty
- 3.25 kg
ActionHow it cycles, what trips it, and what feeds it.
- Action
- Gas operated short stroke piston
- Firing mechanism
- Hammer fired
- Trigger
- Single stage
- Capacity
- 30
- Magazine
- Detachable box
MaterialsEach swatch is the material itself, not a colour chosen to stand for it.
- Frame
- Polymer
- Barrel
- Steel
- Stock
- Polymer
- Finish
- Cerakote
BallisticsFrom the service cartridge, not a handload.
- Effective range
- 500 m
- Rate of fire
- 740 rpm
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.
Bullpup configuration
Short stroke gas piston
Non reciprocating cocking handle
Ambidextrous controls
Drop free magazine release
Nato standard rails- Otb socom compliant
Cold hammer forged barrel
Cerakote finish
Grenade launcher compatible
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 158 5.56x45mm NATO assault rifles | 3.25 kg | 3.60 kg | Lighter than about 80% |
| Overall lengthAmong 156 5.56x45mm NATO assault rifles | 701 mm | 920 mm | Shorter than about 90% |
| Barrel lengthAmong 157 5.56x45mm NATO assault rifles | 407 mm | 449 mm | Shorter than about 70% |
| Magazine capacityAmong 158 5.56x45mm NATO assault rifles | 30 | 30 | Near the median |
Its place in the rankings
Answers
Questions about the Lithgow F90 MBR
How much does the Lithgow F90 MBR weigh?
The Lithgow F90 MBR weighs 3.25 kg (7.17 lb) empty.
What caliber is the Lithgow F90 MBR?
The Lithgow F90 MBR is chambered in 5.56x45mm NATO.
How many rounds does the Lithgow F90 MBR hold?
The Lithgow F90 MBR holds 30 rounds, fed from a detachable box magazine.
How long is the Lithgow F90 MBR?
The Lithgow F90 MBR is 701 mm (27.6 in) long overall, with a 407 mm (16.0 in) barrel.
Who makes the Lithgow F90 MBR?
The Lithgow F90 MBR is made by Lithgow Arms (Australia).
When was the Lithgow F90 MBR introduced?
The Lithgow F90 MBR was introduced in 2020.
How does the Lithgow F90 MBR operate?
The Lithgow F90 MBR uses a gas operated short stroke piston 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
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/lithgow-f90-mbr' \ --header 'X-API-Key: your_key'{ "id": "lithgow-f90-mbr", "name": "Lithgow F90 MBR", "manufacturer": { "id": "lithgow-arms", "name": "Lithgow Arms", "countryCode": "AU", "foundedYear": 1912, "website": "https://www.lithgowarms.com", "logoUrl": null, "description": null, "status": "active", "defunctYear": null, "stateOwned": null, "makesFirearms": true, "parentId": null, "predecessorId": null, "createdAt": "2026-02-11 23:44:38", "updatedAt": "2026-02-18 03:43:49", "version": "e7879fcd94b135ad87d81c6abc932a9a55e8d801861c29f7d97830f0d7f9b395" }, "category": { "id": "assault-rifle", "name": "Assault Rifle", "description": "Selective-fire rifles chambered in intermediate cartridges" }, "country_of_origin": "AU", "year_introduced": 2020, "barrel_length_mm": 407, "weight_empty_g": 3250, "action_type": "gas_operated_short_stroke_piston"}