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FBP SMG (Fabrica de Braco de Prata)

Submachine Gun (SMG) [ 1948 ]

The FBP became a rare Portuguese submachine gun design utilizing components from the German MP40 and American M3 Grease Gun lines.

Authored By: Staff Writer | Last Edited: 07/11/2017 | Content ©www.MilitaryFactory.com | The following text is exclusive to this site.

With development stemming from 1940, this Portuguese submachine gun evolved in the post-World War 2 years into the "FBP" (Fabrica de Braco de Prata). The war introduced all sorts of capable designs, functions, and components to which several were simply incorporated into the original Portuguese design. Design of the weapon was attributed to Portuguese Army Major Goncalves Cardoso and the weapon led a healthy frontline service life nearing 30 years.

The FBP utilized the telescoping bolt, barrel, and general construction (steel pressings) of the German wartime MP40 submachine gun along with the pistol grip, trigger mechanism, and wire stock of the famous American M3 "Grease Gun". The resulting FBP was chambered for the ubiquitous 9x19mm Parabellum German pistol cartridge and fired through a blowback action - limited to full-automatic only. The rounds were fed via a 21- or 32-round detachable straight box magazine. The weapon's arrangement was conventional with a standalone pistol grip/trigger unit, receiver, magazine well set ahead of the pistol grip, and barrel. The barrel section was unique in that the designs saw fit to add support for a bayonet. Sighting was through a front and rear iron arrangement. Performance specifications included a rate-of-fire of 500 rounds per minute with a muzzle velocity of 1,280 feet per second. As in the M3 Grease Gun, the wire stock of the FBP was collapsible for compactness. The cocking handle was set along the left side of the receiver within a long-running channel.©MilitaryFactory.com
In practice, the FBP proved a reliable weapon and well developed for the rigors of military service. Its steel pressing manufacture approach made the weapon suitable for mass production. If there proved one downfall it was in accuracy at range - which can be expected of a "mutt" gun design like the FBP. The original full-automatic-only m/948 was then followed by the improved m/963 which introduced a select-fire capability by incorporating a semi-automatic action. The m/963 was then, itself, followed by the modernized m/973 which introduced a perforated barrel jacket to help with cooling. These were not produced serially. Internally, however, all models of the FBP line remained largely the same.

The Portuguese Army eventually gave up their FBP submachine guns in favor of the Israeli UZI. FBP service therefore spanned from 1948 into the 1980s. The weapon also fell into use by non-military elements in combat across several former Portuguese colonies.©MilitaryFactory.com
Note: The above text is EXCLUSIVE to the site www.MilitaryFactory.com. It is the product of many hours of research and work made possible with the help of contributors, veterans, insiders, and topic specialists. If you happen upon this text anywhere else on the internet or in print, please let us know at MilitaryFactory AT gmail DOT com so that we may take appropriate action against the offender / offending site and continue to protect this original work.


Service Year

Portugal national flag graphic


Submachine Gun (SMG)

Fabrica de Braco de Prata - Portugal
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National flag of Angola National flag of Guinea National flag of India National flag of Mozambique National flag of Portugal Angola; East Timor; Guinea; India; Mozambique; Portugal
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Overall Length
807 mm
31.77 in
Barrel Length
250 mm
9.84 in
Empty Wgt
8.31 lb
3.77 kg

Iron Front and Read


Blowback; Full-Automatic Only; Telescoping Bolt

Rounds are automatically ejected from the breech, a new cartridge stripped from the feed and set in the chamber, and rounds are continuously fired so long as the trigger is pulled and an ammunition supply exists.
Blowback Operation
Gas pressure from the rearward movement of the ignited cartridge case provides the needed bolt movement, ejecting the spent case and stripping a fresh case from the magazine.
(Material presented above is for historical and entertainment value and should not be construed as usable for hardware restoration, maintenance, or general operation - always consult official manufacturer sources for such information)


9x19mm Parabellum

Sample Visuals**

Graphical image of a 9mm pistol cartridge
Rounds / Feed

21- or 32-round detachable box magazine
Cartridge relative size chart
*May not represent an exhuastive list; calibers are model-specific dependent, always consult official manufacturer sources.
**Graphics not to actual size; not all cartridges may be represented visually; graphics intended for general reference only.
Muzzle Velocity
1,280 ft/sec
(390 m/sec)

FBP - Base Series Designation
m/948 - Model of 1948; original production model; full-automatic fire only.
m/963 - Model of 1963; upgraded model; semi-automatic fire function introduced.
m/976 - Model of 1976; modernized FBP; perforated barrel jacket; not produced.

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