MP9

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MP9 may refer to:

Brügger + Thomet MP9-N

Ruger MP9

• The Brügger + Thomet MP9-N, a 9x19mm Parabellum submachine gun, known for being an improved version of the Steyr TMP machine pistol
• The Ruger MP9, another, unrelated 9x19mm Parabellum submachine gun, known for being an improved version of the IMI UZI submachine gun