MP5’s Roller

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How the MP5’s Roller-Delayed Blowback Action Works

July 15, 2022
MP5’s Roller

The MP5, one of the most infamous SMG platforms ever devised, hinges largely on the success of its action. Known as a roller-delayed blowback operating system, the MP5’s action is an object of interest among shooters, collectors, firearms enthusiasts, historians, and others. Many semi-automatic pistols and submachine guns use a direct blowback operation to cycle […]