FBP submachine gun

Lore & Background

The FBP submachine gun utilized the large bolt and telescoping operating spring of the German MP40 submachine gun, and the collapsible wire stock of the American M3 submachine gun. Unusual for submachine guns, the m/948 was fitted with a barrel sleeve with a mount to accept the standard Portuguese Mauser bayonet. The original version only allowed for fully automatic fire; an upgraded version designated FBP m/963, introduced in 1961, also allowed for semi-automatic fire.

The weapon was primarily issued to officers and NCOs in the Portuguese Armed Forces and security forces, along with quantities of ex-German MP 34 submachine guns. In Portuguese service it was used in combat in Angola, Portuguese Guinea, Mozambique, Portuguese India and Portuguese Timor. It was eventually replaced in service by the 9 mm Uzi and the collapsible-stock version of the standard m/961 G3 rifle.

In 1976 Fábrica Militar de Braço de Prata, led by Major Engenheiro Mário Tavares, developed a modernized version of the FBP with a barrel cooling sleeve, but it never entered production. Users included Portugal, Angola, and East Timor, where it was used by the FALINTIL and some were inherited by the Timor-Leste Defence Force.

Reader's Guide

The FBP submachine gun represents a notable example of mid-20th-century Portuguese small arms design, blending features from two prominent World War II-era weapons: the German MP40 and the American M3. Its adoption in 1948 as the m/948 provided Portuguese forces with a domestically produced submachine gun that saw extensive service across Portugal's colonial territories, including Angola, Mozambique, and Portuguese India. The weapon's unusual bayonet mount, accepting the standard Portuguese Mauser bayonet, reflected a design philosophy that valued versatility in close-quarters combat. The introduction of the m/963 variant in 1961 added semi-automatic fire capability, adapting the weapon to evolving tactical needs. Despite its eventual replacement by the Uzi and the collapsible-stock G3 rifle, the FBP remained in use with Portuguese security forces and saw continued service in East Timor with the FALINTIL and later the Timor-Leste Defence Force. The 1976 modernization attempt, though never produced, indicates ongoing interest in the platform. The FBP's legacy is tied to the Portuguese Colonial Wars and the broader history of Portuguese military procurement.

Did You Know?

• The FBP's design was first conceived in 1940 by Gonçalves Cardoso, an artillery officer in the Portuguese Army.
• It combined the bolt and spring of the German MP40 with the collapsible wire stock of the American M3.
• The m/948 variant had a barrel sleeve mount for a standard Portuguese Mauser bayonet.
• A modernized version with a barrel cooling sleeve was developed in 1976 but never entered production.