The SIG Sauer P320 Compact OR is a 9mm Luger striker-fired pistol with a 3.9-inch barrel, 7.2-inch overall length, 10+1 capacity (two 10-round steel magazines included), and 26 oz weight. The frame is polymer; finish is Nitron Black. Sights are SIGLite front and rear night sights. The slide is optics-ready via PRO optic footprint. 
 

Key Specifications 

• Manufacturer: SIG Sauer 
• Model: P320 Compact OR 
• Caliber: 9mm Luger (9x19 Para) 
• Action Type: Striker Fired 
• Barrel Length: 3.9 inches 
• Overall Length: 7.2 inches 
• Capacity: 10+1 rounds (includes two 10-round steel magazines) 
• Weight: 26 oz (shipping weight: 3.3 lbs) 
• Frame Material: Polymer 
• Finish Type: Nitron Black 
• Sights: SIGLite Front & Rear Night Sights 
   

Detailed Features 

The P320's modular design is its most distinctive characteristic: the serialized fire control unit can be moved between different grip modules and slide sizes without tools. The carbon steel barrel has a DLC coating for durability. The medium compact grip module has an accessory rail for lights and lasers. SIGLite night sights are tritium-based and work without ambient light. The PRO optic footprint lets you mount a red dot directly without additional adapters -- a useful feature that avoids the height-over-bore issues common with other optics-ready setups. 
 

Usage Scenarios 

Concealed carry, home defense, competition, and tactical use. The optics-ready design is particularly useful for competition shooters and those who run red dots for defensive carry. The modular grip system lets one serialized unit serve across multiple configurations.

The P320 Compact OR gets broad positive feedback for its modular design and optics compatibility. Shooters appreciate being able to change grip sizes and swap configurations around the same serialized unit. The optics-ready footprint is a genuine convenience -- buyers can mount a red dot without sending the slide out for milling.

Ergonomics are well-regarded overall, though some find the compact frame slightly bulkier than competing options at the same size class. The trigger gets generally positive marks with a smooth pull and clean break, though some experienced competition shooters prefer different setups. Aftermarket support for the P320 platform is strong. Price is typically seen as fair for the feature set, though budget-conscious shoppers can find comparably-sized 9mm pistols for less.