The P320-M18 is a compact, optics-ready striker-fired pistol built for duty and concealed carry. Based on the U.S. Army’s M17/M18 service pistol platform, it offers proven reliability in a size suitable for everyday use. We added this model to our catalog in Q4 2025 based on consistent positive feedback from our customers and reliable supply. It’s a solid choice for the shooter who wants a no-nonsense, military-proven handgun ready for a red dot.
Stand-Out Features
- Military-Proven Platform: The operating system is identical to the U.S. Army’s M18 service pistol, tested for reliability under demanding conditions.
- Optics-Ready Slide: The slide is cut from the factory to accept SIG Romeo1Pro and Leupold DeltaPoint Pro optics, with an adapter plate included for other footprints.
- Manual Safety: Includes an ambidextrous manual thumb safety, a feature carried over from the military specification for an added layer of security.
- Modular FCU: The serialized Fire Control Unit can be swapped into different SIG P320 grip modules and slides, allowing for easy customization.
- Night Sights: Comes equipped with SIGLITE night sights for low-light visibility, with a high-contrast front dot.
Technical Data
| Caliber | 9mm |
| Barrel Length | 3.9″ |
| Overall Length | 7.2″ |
| Height | 5.5″ |
| Width | 1.3″ |
| Weight (measured) | 4.3 oz |
| Capacity | 17+1 (includes two magazines) |
| Frame Finish | Coyote Tan Polymer |
Your Questions Answered
Is this ready for a red dot sight out of the box?
Yes. The slide is pre-cut for SIG’s Romeo1Pro and Leupold DeltaPoint Pro footprints. An adapter plate is included in the case to accommodate other popular micro red dot patterns.
What’s your staff’s recommendation for a break-in period?
Our staff handles every firearm we sell. For this model, we recommend firing 50 rounds of quality 9mm ammunition to ensure smooth operation of the slide and trigger before considering it for defensive carry.
Does it come with a manual safety?
Yes. The P320-M18 includes an ambidextrous manual thumb safety, matching the configuration of the U.S. military’s M18 pistol. The safety is positive and easy to operate.
✅ Plain brown box — no markings
✅ Not happy? Return within 30 days.
✅ Checkout secured with SSL encryption
✅ Domestic shipping — no customs
Reviews
There are no reviews yet.