Is the rotating barrel like the Beretta PX4?

Beretta follows the same pattern of many other manufacturers trying to do a rotary locking system, using a machined lug on the barrel to ride in a milled slot in the frame. It needs generous tolerances to function.

Grand Power instead uses a roller bearing in the frame to match up with a flat helical cam path on the barrel. This allows for tighter tolerances and higher reliability.

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