FBP
FBP m/948
Type	Submachine gun
Place of origin	Portugal
Service history
In service	1948-1980s
Used by	Portugal
Wars	Portuguese Colonial War
Production history
Designer	Major Francisco Gonçalves Cardoso
Designed	1948 (production model)[1]
Manufacturer	Fábrica de Braço de Prata (FBP)
Produced	1948-1955 (FBP m/948)[1][2] 1961-1980 (later models)[1]
Variants	m/948, m/963 and m/976
Specifications
Mass	3.77 kg (8.31 lb)[2]
Length	807 mm (31.8 in)
Cartridge	9×19mm Parabellum
Action	Blowback
Rate of fire	500 rounds/min[2]
Muzzle velocity	390 m/s (1,280 ft/s)
Feed system	21, 32-round box magazine
Sights	Iron

FBP is a 9 mm submachine gun originally developed from a design first conceived in 1940 by Gonçalves Cardoso, an officer of artillery in the Portuguese Army. The onset of World War II halted development of the weapon, which was further modified and put into production in 1948.

History

The submachine gun was produced by the Fábrica de Braço de Prata weapon factory at Lisbon,^[3] whose initials FBP gave the name to the weapon, adopted for service as the m/948 in 1948. It 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.^[4] Unusual for submachineguns, the m/948 was fitted with a barrel sleeve with a mount to accept the standard Portuguese Mauser bayonet.

The original version of the submachine gun (the FBP m/948) 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.^[3]