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X4

X5

FNA-B X Models
Country of origin

Italy

Manufacturer(s)

Fabrica Nazionale d’Armie Brescia

Year(s) designed

1954 - 1955

Weapon type

Submachine gun

Caliber

9×19mm Parabellum

Action

Blowback

Overall length

26in (X4)
12.4in (X5)

Barrel length

7.5in (X4)
4.6in (X5)

Weight

6.6lbs (X4)
6.3lbs (X5)

Magazine/Cylinder capacity

40 rounds (X4)

Cyclic rate

600rpm (X4)
700rpm (X5)

The X4 was an Italian submachine gun designed by Fabrica Nazionale d’Armie Brescia in 1954.

HistoryEdit

FNA-B marketed the X4 in 1954, and the shortened X5 model a year later. Both guns were extremely cheap to produce and cost-efficient, and FNA-B planned a production run of 100,000 models. However, with no orders for the weapon, the gun ultimately never entered mass production and only a limited number were ever made.

The X5 model was, at the time of its design, one of the shortest submachine guns available.

DesignEdit

Both the X4 and the X5 were constructed almost entirely from stamped sheet metal. The bolt was cylindrical with a fixed firing pin and the cocking handle was attached to a sleeve that wrapped around the entire bolt. The magazine housing was especially deep. Only fully-automatic fire was possible. The X4 utilized a retractable wire stock, but the X5 did not.