The Brügger & Thomet MP9 (Machine Pistol 9mm) is a machine pistol designed and manufactured by Brügger & Thomet of Switzerland. The MP9 is a selective-fire 9x19mm Parabellum caliber machine pistol. It uses 15, 20, 25, 30 round transparent polymer detachable box magazines. It has three safeties; ambidextrous safety / fire mode selector switch button (manual safety), trigger safety, and drop safety. The MP9 is a development of the Steyr TMP. Differences from the TMP include a stock that folds to the right side of the weapon, an integrated Picatinny rail, and a new trigger safety.
- Has +5 Critial chance bonus.
- MP9 SP PN has a bug that displays the ammo pool of 225 (250 with extended magazine) while in game it only shows 120.
- The MP9-H C R6 is a unique Tier IX (9) weapon which was released in the Rainbow Six packs.