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Beretta PX4 Pistol

Sometimes it takes a company a few years to evolve a new design. Beretta's M9 / 92F 9mm handgun - and the subsequent .40S&W caliber versions - was, and still is, an excellent design. That said, is there always room for improvement? Yes. Otherwise the firearms industry would be stuck with flintlock rifles and handguns. There are several notable design evolutions incorporated in the Beretta PX9 and PX4 pistols. The closed side, the rotating barrel and the polymer frame with interchangeable backstraps all help the handgun bring Beretta into the new millennium.
http://www.borelliconsulting.com/evals/guns/berettapx4.htm