FN Browning "3-Spot" Machine Pistol

FN Browning "3-Spot" Machine Pistol is 3-Spot machine-/automatic pistol is designed for law enforcement duties in the more dangerous parts of Europe. Set for purely accurate fire suppression, the pistol with each pull of its trigger unleashes a three-round burst of 10mm caseless slugs. The magazine holds 24 rounds, allowing eight shots. This pistol is in use in the U.K., France, Belgium and Italy.

Source

 * Rough Guide to the UK, pg.36
 * Blackhand's Street Weapons, pg.11