The Sig Sauer P320 SXG Reserve is a full-size striker-fired pistol chambered in 9mm Luger with a 3.9-inch barrel and an integrated compensator. It has a high-polish DLC finish, GridLOK grip panels, and an optic-ready slide. Capacity is 21+1 rounds. 
 

Key Specifications 

• Brand: Sig Sauer 
• Model: P320 SXG Reserve 
• Caliber: 9mm Luger 
• Action: Semi Auto 
• Capacity: 21+1 
• Barrel Length: 3.9 in 
• Color/Finish: Hi-Polish Black DLC 
   

Detailed Features 

• Integrated compensator built into the slide/barrel assembly 
• High-polish DLC finish on slide 
• GridLOK interchangeable grip panels 
• Optic-ready slide 
• Full-size P320 frame with 21-round magazines

Owners of the P320 SXG Reserve are largely drawn to the Reserve Collection aesthetic. The high-polish DLC finish gets strong reactions, mostly positive, though a few owners note it shows fingerprints and handling marks quickly and requires more maintenance to keep looking clean.

The integrated compensator on the SXG is a standout feature for many. Shooters running the pistol on the range report noticeably reduced muzzle flip compared to a standard P320 of similar barrel length. Some owners point out that the integrated comp design limits aftermarket barrel options, which matters to those who want to suppress or swap components.

GridLOK grips are divisive. Fans of the system appreciate the modular texture and size options. Detractors find the grip change process fussy and prefer simpler aftermarket solutions. The 21-round capacity consistently earns praise from owners who prioritize ammunition capacity.