The Sig Sauer M17 is a 9mm, striker-fired pistol on the P320 platform. The slide carries a ROMEO-M17 red dot optic mounted from the factory, and the barrel runs 4.7 inches. It ships with the MOD X polymer grip module, a manual safety, and one 17-round magazine for a 17+1 capacity. This is the "Off Duty" configuration, aimed at shooters who want the M17 layout with the optic already set up rather than adding one later. 
 

Key Specifications 

• Brand: Sig Sauer 
• Model: M17 
• Caliber: 9mm 
• Action: Semi Auto 
• Capacity: 17+1 
• Barrel Length: 4.7 inches 
   

Detailed Features 

• Factory-mounted ROMEO-M17 red dot optic set up on the slide already 
• MOD X polymer grip for confident, all-day control 
• Includes a manual safety lever for shooters who want that option 
• 17-round magazine included, for a 17+1 capacity 
• Striker-fired trigger built on the P320 architecture 
• 4.7-inch barrel sized for a balanced, full-size grip-to-sight radius 
• Sighting system tuned for quick target transitions and fast follow-up shots

Owners of the M17 tend to like that it ships with an optic already mounted, since that removes the extra step and cost of sending the slide out for milling or buying a separate red dot. The manual safety is a point some traditional striker-fired shooters have to get used to, but duty and military-adjacent buyers who wanted the M17 specifically for that feature are generally happy it's there.

Ergonomics get good marks thanks to the MOD X grip module, with most owners describing the trigger reach and grip angle as comfortable across a range of hand sizes. The 4.7-inch barrel puts it in a full-size carry footprint, and how it carries day to day depends a lot on the holster setup the owner pairs it with.

On value, buyers see the factory-optic package as a way to avoid piecing together a red-dot setup themselves, though a few owners note that a dedicated aftermarket optic can still outperform the factory-installed unit. Aftermarket support for the P320 family is broad, so magazines, holsters, and grip modules are easy to find.