The Sig Sauer P320 M17 is the civilian version of the U.S. Army's M17 service pistol. It's a full-size striker-fired 9mm with a 4.7-inch barrel, 17-round capacity, and a coyote tan PVD finish on both frame and slide. SIGLITE night sights (1-dot front, 2-dot rear) are standard, and the modular FCU lets you change grip module size or caliber without tools. 
 

Key Specifications 

• Caliber: 9mm Luger (9x19 Para) 
• Barrel Length: 4.7 inches 
• Capacity: 17 rounds 
• Weight: 1.85 lbs (29.6 oz) 
• Action Type: Double Action 
• Manufacturer: Sig Sauer 
• Model Number: P320 M17 
• MSRP: $768 
   

Detailed Features 

 
The P320's modular design is the headline: the serialized FCU (fire control unit) is the legal firearm, and you can swap it between different grip module sizes and calibers by swapping parts rather than buying a new gun. The coyote tan PVD finish is the same treatment used on the military variant and holds up to field conditions. SIGLITE night sights give you a usable sight picture in low light without needing a weapon light. 
 

Usage Scenarios 

1. Home defense: 17-round capacity, night sights, and reliable action cover most home defense requirements. 
2. Everyday carry: at 29.6 oz it's carry-feasible for shooters who prefer full-size pistols. 
3. Competitive shooting: the modular grip system and smooth trigger translate well to USPSA Production or Carry Optics divisions.

The P320 M17 reviews are largely positive, with two ongoing concerns that any honest buyer should know about.

Modularity is the most celebrated feature. Owners appreciate being able to resize the grip or change calibers without buying a new FCU. The ergonomics land well for most shooters — the grip angle and texture get consistent praise. Reliability across ammunition types is routinely cited; the P320 platform has a strong track record in professional service environments, which carries weight in civilian discussions. The trigger pull is widely described as smooth and consistent.

The two substantive criticisms: size and past safety concerns. At full-size dimensions, the M17 is not the most practical concealed carry option, and some users point to more compact alternatives if CC is the primary use case. The drop safety issue from earlier P320 versions (pre-voluntary upgrade program) comes up regularly in discussions — most community members note the issue has been addressed, but it's part of the P320's history and worth researching before purchase. Price is occasionally debated, but most buyers consider the feature set fair for the cost.