The Sig Sauer P320 MAX is a full-size semi-automatic pistol chambered in 9mm with a 3.9-inch barrel and a 21-round magazine capacity. It has a two-port ported slide with an integrated expansion chamber, a matte black DLC finish, and a full-length X-Series grip module. The slide is optic-ready with XRay night sights installed. 
 

Key Specifications 

• Brand: Sig Sauer 
• Model: P320 MAX 
• Caliber: 9mm 
• Action: Semi Auto 
• Capacity: 21 rounds 
• Barrel Length: 3.9 inches 
• Color/Finish: Black 
   

Detailed Features 

• Two-port ported slide with integrated expansion chamber for reduced muzzle rise 
• Optic-ready slide with direct optic cut 
• XRay night sights 
• Full-length X-Series grip module with beavertail and Picatinny rail 
• Three 21-round magazines included

Owners of the P320 MAX tend to buy it specifically for the ported slide and competition-oriented configuration. The two-port design with the integrated expansion chamber is noticeable in terms of muzzle control during rapid fire, and most find the transition from a standard P320 is immediately apparent at the range.

The 21-round capacity and full-length X-Series grip are positives for competition and range use; they make the pistol large for concealed carry, and most owners treat it as a dedicated range or competition gun. The XRay sights are well-regarded and remain usable even under optic-ready cuts. Three magazines in the box is a selling point that owners consistently mention.

The P320 MAX sits at a premium price. Some owners feel the porting and competition features justify it; others note that the same P320 platform can be built to similar specs from parts at lower cost. The DLC finish holds up well and the X-Series grip texture gets mostly positive comments, though a few find it aggressive for extended sessions.