Beretta USA is taking a different approach with its PX4 family of pistols. If you want a PX4, you can choose from three different trigger systems, three different operating mechanisms, three different size magazine release buttons, two different size slide safety levers, three different sizes of interchangeable (back straps) grips, two different sizes of Trijicon front sights, and 10 different rear sights on LE models. (Civilian models have four optional rear sights and one standard front sight.)
Family Heritage
Just like its predecessor, the Beretta Cougar, the full-size PX4 uses a very reliable, accurate, and effective rotary barrel system that is designed to reduce recoil.
The first time I test fired a Beretta pistol with a rotary barrel system was when I purchased a Cougar 8045D. Even though this particular pistol had a short (3.7-inch) barrel and was chambered in .45 ACP, it proved to be relatively comfortable to shoot.
Beretta didn't use the rotary barrel system on the subcompact PX4, and I think that was a mistake. I would have also preferred a slightly longer barrel on this weapon. Still, despite these minor quibbles, I think the PX4 subcompact is an amazing pistol.