The M&P 5.7 with its rotating 5"Tempo Barrel System utilizes the ballistics of the 5.7x28mm round in tandem with the repeatability of the Tempo System. Get worry-free consistency, in a 22+1 handgun. The M&P 5.7 features internal hammer-fired, gas-operated, locked-breech TEMPO barrel system (barrel doesn't cam open until bullet passes gas port); slim, optimally textured grip; ambidextrous slide stop; No Thumb Safety; reversible magazine release; slide cut for optics; flat-face trigger for consistent finger placement allows for more accurate and repeatable shooting; Picatinny-style rail; forward slide serrations; single-action trigger break and 1 in 9" twist barrel. Includes two magazines.