The Sig Sauer P320 X-VTAC is a full-size 9mm striker-fired pistol built around the modular P320 platform. It ships with VTAC Day-Night sights — front 1-Dot and rear 2-Dot — tuned for fast target acquisition in variable lighting. 
 

Key Specifications 

• UPC: 798681604517 
• Caliber: 9MM Luger (9x19 PARA) 
• Action: Striker 
• Capacity: 17 rounds 
• Barrel Length: 4.7 inches 
• Weight: 1.9 lbs (29.5 ounces) 
• Finish: Black / Flat Dark Earth 
   

Features 

 
The polymer frame is full-sized, which helps manage recoil and gives a stable grip surface. Barrel is carbon steel. The P320's modular FCU design means you can swap grips, slides, or calibers without additional registration — useful if you want to configure the same serialized unit differently over time. 
 
At 4.7 inches of barrel and just under two pounds, this isn't a carry-optimized gun. It's sized for range work, competition, or duty use where you're not worried about printing. 
 

Who It's For 

• Competitive shooters who want the VTAC sight setup and P320 modularity. 
• Home defense buyers who want 17+1 in a 9mm with fast sight acquisition. 
• Shooters already in the P320 ecosystem who want a range/competition config.

Feedback on the P320 X-VTAC is mostly positive, with a few consistent gripes.

Ergonomics come up often — users find the grip comfortable during long sessions and the texture gives a solid hold without being abrasive. Accuracy reports are generally good, and the VTAC sights get specific praise for their speed in low-light target acquisition.

The P320's modularity is a recurring selling point. Being able to swap grip modules, slides, or calibers on the same FCU appeals to owners who want flexibility without buying another gun.

On the negative side: the trigger pull gets mixed reviews. Some shooters describe it as heavier than expected or less refined than other striker guns they've run. The full-size frame also draws criticism from anyone who tries to carry it — it's not a compact, and a few buyers underestimated the size before purchasing.

Price is another friction point. The X-VTAC sits at the higher end of the striker-fired market, and some owners feel the premium over a standard P320 is hard to justify unless you specifically want the VTAC sight configuration.

Overall, it's well-regarded among enthusiasts who know what they're buying, but the size and price occasionally catch buyers off guard.