The SIG Sauer P320-M18 is a compact, modular striker-fired pistol built for duty and personal defense. It’s designed for shooters who require a reliable, adaptable platform with proven military heritage. This model has been on our shelves since spring 2025 with a low return rate, confirming it consistently meets user expectations.
Key Features
- Modular FCU (Fire Control Unit) allows for easy caliber and grip module swaps.
- Optics-ready slide with removable rear sight plate for direct red dot mounting.
- Manual safety provides an additional layer of security.
- Includes two 17-round magazines and a 21-round magazine.
- Flat-blade trigger offers a crisp, consistent pull.
Specifications
| Caliber | 9mm |
| Barrel Length | 3.9″ |
| Overall Length | 7.2″ |
| Height | 5.5″ |
| Width | 1.3″ |
| Sights | Optics-ready, removable rear plate |
| Weight (measured) | 2.5 oz |
| Magazine Capacity | 2x 17-round, 1x 21-round |
Frequently Asked Questions
Is the slide cut for a specific red dot footprint?
The slide is cut for the SIG Sauer Romeo1Pro footprint. It will also accept other optics using the appropriate adapter plate from SIG.
Can I change the sights?
Yes. Our staff has confirmed compatibility with both factory SIG sights and aftermarket options from Trijicon and AmeriGlo.
What is the modular FCU?
The serialized Fire Control Unit is the core component. It can be moved between different grip modules and slides, allowing you to change the pistol’s size and caliber.
✅ Same-day shipping from Rockford, IL
✅ Discreet packaging
✅ 30-day returns
✅ Secure checkout
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