The Sig Sauer P320 Compact is a striker-fired 9mm pistol with a 3.9-inch barrel, 15-round capacity, and a modular design that lets you swap grip modules to fit different hand sizes. The black Nitron slide sits on a polymer frame with an overall length of 7.20 inches. 
 

Key Specifications: 

• Brand: Sig Sauer 
• Model: P320 Compact 
• Caliber: 9mm Luger (9x19 Para) 
• Action: Striker Fire 
• Capacity: 15 rounds 
• Barrel Length: 3.9 inches 
• Weight: 1.5 lbs (25.80 oz) 
• Finish: Black Nitron Slide 
   

Features: 

The striker-fired action gives a consistent trigger pull every shot. Interchangeable grips let you dial in fit without buying a new gun. Safety systems include disconnect and striker safeties. The polymer frame keeps weight reasonable while giving a solid grip surface. 
 

Who It's For: 

The P320 Compact occupies the space between a full-size duty gun and a true pocket pistol — comfortable to shoot, 15+1 rounds, and compact enough for carry. Shooters who want no external safety and a consistent pull will be comfortable here; those who prefer a manual safety may want to look at other options.

The P320 Compact in Black Nitron gets broadly positive marks. The modular design draws particular praise — being able to change grip size without gunsmith work is genuinely useful, and owners mention that the pistol fits a wider range of hand sizes than most fixed-frame guns.

Ergonomics and trigger feel come up often in a positive way. The consistent striker-fired pull works well for most shooters, and recoil is manageable for a 9mm compact. Reliability with different ammunition types is a frequent topic and generally comes out well.

Two criticisms surface regularly. First, weight: at 25.80 oz some carriers find it heavier than competing compact options, which gets tiring over a full day. Second, the absence of an external safety gives some users pause about carrying striker-fired, though others count it as a feature rather than a gap. Occasional slide lock engagement issues appear in some feedback, though not consistently.

Overall the sentiment is solid — it's a well-regarded, versatile pistol with a small number of real trade-offs that mostly come down to personal preference.