B&T GHM45
- Category
- Submachine Gun
- Barrel
- 175 mm
- Weight, empty
- 2.10 kg
- Introduced
- 2024
About
What it is, and why it matters
The B&T GHM45 is a Swiss .45 ACP pistol-caliber submachine gun and carbine derived from B&T's GHM9/APC family. It uses a closed-bolt, hydraulic-buffered direct-blowback action to tame the recoil of the large .45 ACP cartridge, with a fully ambidextrous aluminum upper and polymer lower, a two-stage trigger and a tri-lug threaded muzzle. Marketed as a cost-effective, competition-oriented platform, it is offered in pistol and short-barreled configurations feeding from a 25-round detachable box magazine.
B&T's 'GHM' name stands for Grasshopper Mouse, a desert rodent famous for hunting and eating scorpions, a running jab at rival scorpion-named pistol-caliber carbines; the GHM45 brings that lineage into the heavier .45 ACP class.
Part of B&T's rapid-deployment family of .45 ACP pistols and SBRs, sharing controls and ergonomics with the 9mm GHM9. The 'GHM' designation stands for 'Grasshopper Mouse', continuing B&T's naming theme.
Specification
Everything measured
IdentityWhat it is, who built it and when.
- Manufacturer
- B&T AG (Brügger & Thomet)
- Category
- Submachine Gun
- Country
- Switzerland
- Status
- In production
- Produced
- 2024
DimensionsAs issued, without a magazine or an optic.
- Barrel
- 175 mm
- Overall length
- 435 mm
- Weight, empty
- 2.10 kg
ActionHow it cycles, what trips it, and what feeds it.
- Action
- Blowback
- Firing mechanism
- Hammer fired
- Trigger
- Two stage
- Capacity
- 25
- Magazine
- Detachable box
MaterialsEach swatch is the material itself, not a colour chosen to stand for it.
- Frame
- Aluminum
- Slide
- Aluminum
- Barrel
- Steel
- Stock
- Polymer
BallisticsFrom the service cartridge, not a handload.
- Effective range
- 50 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.
Features
What it has
What the record lists as fitted, drawn from the catalogue.
Fully ambidextrous controls
Two stage trigger
Hydraulic recoil buffer
Tri lug threaded muzzle
Top and underbarrel picatinny rails
Backup iron sights
Aluminum upper polymer lower
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 282 submachine guns | 2.10 kg | 3.15 kg | Lighter than about 90% |
| Overall lengthAmong 281 submachine guns | 435 mm | 737 mm | Shorter than about 90% |
| Barrel lengthAmong 282 submachine guns | 175 mm | 213 mm | Shorter than about 80% |
| Magazine capacityAmong 287 submachine guns | 25 | 32 | Holds fewer rounds than about 90% |
Answers
Questions about the B&T GHM45
How much does the B&T GHM45 weigh?
The B&T GHM45 weighs 2.10 kg (4.63 lb) empty.
What caliber is the B&T GHM45?
The B&T GHM45 is chambered in .45 ACP.
How many rounds does the B&T GHM45 hold?
The B&T GHM45 holds 25 rounds, fed from a detachable box magazine.
How long is the B&T GHM45?
The B&T GHM45 is 435 mm (17.1 in) long overall, with a 175 mm (6.89 in) barrel.
Who makes the B&T GHM45?
The B&T GHM45 is made by B&T AG (Brügger & Thomet) (Switzerland).
When was the B&T GHM45 introduced?
The B&T GHM45 was introduced in 2024.
How does the B&T GHM45 operate?
The B&T GHM45 uses a blowback 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
66%
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/b-and-t-ghm45' \ --header 'X-API-Key: your_key'{ "id": "b-and-t-ghm45", "name": "B&T GHM45", "manufacturer": { "id": "bt-ag", "name": "B&T AG (Brügger & Thomet)", "countryCode": "CH", "foundedYear": 1991, "website": "https://www.bt-ag.ch", "logoUrl": null, "description": null, "status": null, "defunctYear": null, "stateOwned": null, "makesFirearms": null, "parentId": null, "predecessorId": null, "createdAt": "2026-02-11 23:44:38", "updatedAt": "2026-02-18 03:43:43", "version": "92f8fc30d4932021beec6d4bd0c3f6f32f1a53e6214fbb44fd5ad17bb6b08494" }, "category": { "id": "submachine-gun", "name": "Submachine Gun", "description": "Automatic firearms chambered in pistol calibers" }, "country_of_origin": "CH", "year_introduced": 2024, "barrel_length_mm": 175, "weight_empty_g": 2100, "action_type": "blowback"}