The Sig Sauer P320 M18 is a striker-fired 9mm pistol with a 3.9-inch barrel, Coyote PVD frame and grip, Siglite front and rear night sights, and an ambidextrous manual safety. Three magazines are included. 
 

Key Specifications 

• Brand: Sig Sauer 
• Model: P320 M18 
• Caliber: 9mm Luger 
• Action: Striker Fire 
• Capacity: 10+1 rounds 
• Barrel Length: 3.9 inches 
• Weight: 28.1 ounces (1.75 lbs) 
• Frame Material: Stainless Steel with Coyote PVD Finish 
• Grip Material: Coyote Polymer (textured) 
• Sights: Siglite Front & Night Sight Rear Plate 
• Safety Type: Ambidextrous Manual 
   

Detailed Features 

The striker-fire action delivers a consistent pull from shot to shot. Siglite night sights are standard at both ends -- the front dot and rear plate combination works well in low-light conditions without adding a weapon light. The textured Coyote polymer grip holds securely under recoil and adverse conditions. 
 
The Coyote PVD finish resists corrosion and wear. Three magazines in the box mean you don't have to buy spares immediately. 
 
The modular chassis design allows changing grip sizes and slides, which gives the platform flexibility over time.

The Sig Sauer P320 M18 gets generally favorable feedback. Modularity is the most discussed feature -- the ability to swap grip sizes and slides to fit different shooters or applications is valued by owners who want one platform to cover multiple roles.

The compact dimensions and comfortable grip are consistently praised. Most owners find it balanced and easy to control.

The night sights are called out specifically as a practical feature, particularly by owners who use the pistol for home defense or carry. The trigger pull draws positive remarks for smoothness and consistency.

Reliability is a strong theme -- owners report dependable performance across different ammunition types.

On the other side, some buyers note the weight as slightly heavier than other compact 9mm options. Occasional discussions about the striker-fired safety system come up among shooters who carry with one in the chamber and want to weigh the handling implications. Modularity occasionally draws the counterpoint that it adds complexity for shooters who just want a simple carry gun. Overall sentiment is clearly positive.