The Sig Sauer P320 M18 is a 9mm semi-automatic pistol on a carry frame with a 3.9-inch barrel and Coyote PVD finish. It has a manual safety, optics-ready cut, and Siglite night sights. Three 10-round magazines are included. 
 

Key Specifications 

• Brand: Sig Sauer 
• Model: P320 M18 
• Caliber: 9mm 
• Action: Semi Auto 
• Capacity: 10+1 
• Barrel Length: 3.9 in 
• Color/Finish: Coyote PVD 
   

Detailed Features 

• Carry frame with 3.9-inch barrel 
• Coyote PVD finish on slide and controls 
• Manual safety included 
• Optics-ready cut for direct red-dot mounting 
• Siglite night sights and three 10-round magazines included

Owners of the P320 M18 commercial variant appreciate the carry frame size as a practical middle ground. The 3.9-inch barrel gives it a compact profile while retaining a grip length that most shooters find manageable for duty or concealed carry use. The Coyote PVD finish gets consistent praise for durability.

The manual safety on the M18 is a point of debate. Those who prefer a manual safety find it well-placed and easy to actuate, while others who come from striker-fired pistols without one note it adds an extra step in the draw. Siglite night sights are regarded as a genuine value-add at the factory level.

The optics-ready cut is a common purchase driver. Owners running red dots report a clean, low mount. The three included 10-round magazines are appreciated for the price point, though those outside restricted states see the capacity as the main limitation of this commercial configuration.