Premise: The Beretta 93R is a selective-fire machine pistol, designed and manufactured by Italian firearms manufacturer Beretta in the 1970s for police and military use, that is derived from their semi-automatic Beretta 92. The "R" stands for "Raffica", which is Italian for "volley", "flurry", or "burst" (sometimes spoken "R" as ""Rapid"" in English).
Hypothesis: The Beretta 93R was used by police.