The Sig Sauer P320 Compact in .45 ACP is a modular semi-automatic pistol chambered for a caliber with genuine stopping power. The stainless steel slide carries a Nitron coating for corrosion resistance, and the black polymer grip frame is textured for a secure hold. At 25.8 oz. loaded it handles the .45 ACP recoil well without excessive bulk. 
 

Key Specifications 

• Brand: Sig Sauer 
• Model Name: P320 Compact 
• SKU: 178700448 
• UPC: 798681513505 
• Caliber: .45 ACP (Auto) 
• Action Type: Semi-Auto (Double Action Only) 
• Capacity: 9+1 rounds 
• Barrel Length: 3.9 inches 
• Overall Length: 7.2 inches 
• Weight: 25.8 oz (1.6 lbs) 
• Sights: SIGLITE Night Sights 
• Grip Material: Black Polymer, Textured 
• Finish Color/Type: Black Nitron finish 
   

Detailed Features 

 
The Nitron-coated stainless steel slide resists corrosion and wear. SIGLITE night sights give the pistol low-light capability that matters for a defensive carry gun. The modular design means the serialized fire control unit can swap into different grip frames and slide assemblies, so the P320 can reconfigure to different sizes if your needs change. 
 
Trigger pull on the P320 is consistent shot to shot, which helps during both training and defensive use. The 9+1 capacity in .45 ACP is on par with compact pistols in that caliber class. The 3.9-inch barrel keeps overall length manageable at 7.2 inches.

The P320 Compact in .45 ACP with SIGLITE night sights draws generally positive feedback, though a few recurring concerns come up.

The ergonomics get consistent praise. Shooters find it comfortable in hand and well-controlled even with the .45 ACP recoil, and the modular platform earns appreciation for how easily it adapts to different configurations. Night sight performance in low-light conditions is a frequent talking point among people buying it for home defense or carry.

Accuracy and reliability are regarded as solid. Most owners report trouble-free operation across a variety of loads, which builds confidence in the gun.

The compact dimensions relative to other .45 ACP pistols is genuinely appreciated for concealed carry, though some find it still larger than they'd like compared to 9mm compacts. Magazine capacity comes up occasionally; at 9+1 rounds in .45 ACP, some shooters would prefer more capacity given the gun's footprint. Overall, the P320 Compact .45 is seen as a well-built defensive pistol where the caliber choice is the primary trade-off discussion.