The Beretta CX4 Storm is a semi-automatic 9mm carbine with a 16.6-inch cold hammer forged barrel, polymer receiver, and fixed thumbhole stock. It weighs 12.4 lbs (90.8 oz) with an overall length of 29.7 inches and a 15+1 capacity. It accepts standard Beretta 92 magazines. 
 

Key Specifications 

• Brand: Beretta USA 
• Model: CX4 Storm 
• Type: Semi-Automatic Tactical Carbine 
• Caliber: 9mm Luger 
• Barrel Length: 16.6 inches 
• Overall Length: 29.7 inches 
• Weight: 12.4 lbs (90.8 oz) 
• Capacity: 15+1 rounds (compatible with Beretta 92 magazines) 
• Finish Color: Black 
• Condition: New in Box 
   

Features 

• Cold hammer forged barrel for consistent accuracy 
• Adjustable front and rear sights 
• Fixed thumbhole stock for stable hold 
• Manual thumb safety 
• Lightweight polymer receiver 
• Accepts Beretta 92 magazines 
   
  Magazine compatibility with the Beretta 92 is a practical advantage for shooters who already own that pistol -- one magazine platform covers both guns. The 29.7-inch overall length and pistol-caliber operation make it workable in close-quarters settings.

The Beretta CX4 Storm gets consistent marks for ergonomics, accuracy at short to medium ranges, and its Beretta 92 magazine compatibility. That last point is the main reason people choose it over competing pistol-caliber carbines -- if you're already running a Beretta 92 for carry or duty, you can share magazines.

The thumbhole stock feels comfortable to most shooters and the lightweight polymer frame reduces fatigue. Reliability with standard 9mm loads is generally good, with few reports of malfunctions.

The price relative to competitors like the Kel-Tec Sub-2000 or CMMG Banshee draws some scrutiny. The CX4 costs more and has fewer aftermarket customization options than some alternatives. Long-range performance is limited by the caliber and barrel length, which is expected for a 9mm carbine but worth knowing. The overall package is well-regarded for home defense and tactical training use.