The Beretta PX4 Storm Compact is a DA/SA semi-automatic pistol chambered in .40 S&W with a 3.27-inch chrome-lined barrel, 12+1 round capacity, and a polymer frame with black Bruniton steel slide. It weighs 27.40 oz (1.71 lbs) and measures 6.80 inches overall. The ambidextrous safety and firing pin block are standard. Grip backstraps are interchangeable, letting shooters adjust grip size. 
 

Key Specifications 

• Model: Px4 Storm Compact 
• Caliber: .40 S&W 
• Barrel Length: 3.27 inches 
• Capacity: 12+1 rounds 
• Weight: 27.40 oz (1.71 lbs) 
• Frame Material: Polymer with Black Finish 
• Action Type: Semi-Automatic (SA/DA) 
• Overall Length (OAL): 6.80 inches 
• Safety Features: Ambidextrous Safety / Firing Pin Block 
   

Features 

 
The rotating barrel system is the engineering distinction on the PX4 line. Instead of a traditional tilting-barrel design, the barrel rotates slightly during cycling, which redirects recoil rearward rather than upward. In practice, this softens perceived muzzle rise and can help with follow-up shot speed. The chrome-lined barrel adds corrosion resistance and durability over time. 
 
Three-dot white sights give adequate target acquisition across lighting conditions. The ambidextrous controls make it usable for left-handed shooters without modification. At 6.80 inches and under 1.75 lbs, it fits inside the waistband without much bulk.

The Beretta PX4 Storm Compact in .40 S&W gets generally positive marks, with the most consistent praise around ergonomics, reliability, and recoil management.

The compact size is well-received -- the pistol sits nicely between subcompact and full-size, giving a full grip without the bulk of a larger frame. The interchangeable backstraps get mentioned regularly and genuinely help users fit the grip to their hand. Reliability with various ammo types is a consistent positive.

The rotating barrel system draws specific praise from owners who notice the difference compared to conventional pistols -- .40 S&W is a snappy caliber, and the design does reduce felt muzzle rise.

Trigger feedback is mixed, as it often is with DA/SA pistols. DA pull length and weight draw some complaints; SA pull is more favorably reviewed. Some shooters find the overall weight higher than comparable compact pistols. Aftermarket support for holsters and accessories is more limited than for Glock or SIG compact options, which comes up in customization discussions.