# Sig Sauer P320 M18 9mm 3.9in Black

**Brand:** SIG Sauer
**Category:** Semi-Automatic Handguns
**Caliber:** 9mm

## Specifications

- **Caliber:** 9mm
- **Barrel Length:** 3.9"
- **UPC:** 798681620319
- **SKU:** UCE3nOgU3

## Description

The Sig Sauer P320 M18 is a striker-fired semi-automatic pistol chambered in 9mm with a 3.9-inch barrel. It has a 21-round capacity. The law enforcement version is finished in black.

### Key Specifications
- **Brand**: Sig Sauer
- **Model**: P320 M18
- **Caliber**: 9mm
- **Action**: Semi Auto
- **Capacity**: 21
- **Barrel Length**: 3.9 inches
- **Color/Finish**: Black

### Detailed Features
- Striker-fired P320 platform in M18 compact-carry configuration
- 3.9-inch barrel
- 21-round capacity
- Black finish
- Law enforcement variant

## Frequently Asked Questions

**Q: What caliber is the P320 M18?**

A: The P320 M18 is chambered in 9mm.

**Q: Who makes the P320 M18?**

A: The P320 M18 is made by Sig Sauer.

**Q: What type of firearm is the P320 M18?**

A: It is a striker-fired semi-automatic pistol with a black finish, built on the P320 platform in an M18 compact-carry configuration.

**Q: What is the barrel length of the P320 M18?**

A: The barrel is 3.9 inches long.

**Q: How many rounds does the P320 M18 hold?**

A: It has a 21-round capacity.

**Q: Where can I buy the P320 M18?**

A: Compare current vendor offers on this page.

## What Customers Say

*AI-generated insights from customer reviews*

The P320 M18 occupies the compact slot in Sig's military-contract lineup, and owners often describe it as the sweet spot between the full-size M17 and a true subcompact. The 3.9-inch barrel is short enough for concealed carry while the grip length still accommodates a full hand.

Buyers coming from law enforcement or military backgrounds tend to appreciate the familiar manual of arms and the interchangeable FCU with other P320 variants. The 21-round capacity is a consistent talking point, especially for LE trade-in buyers who want standard-capacity availability.

The same drop-safety conversation that follows the M17 applies here. Current P320 M18 production units are generally accepted as corrected, but buyers with older serials tend to research the revision history. The compact frame draws mixed opinions on grip texture compared to the M17.

## Pricing

**2 offers available**

| Vendor | Price |
|--------|-------|
| Guns Com | $499.99 |
| Guns Com | $849.99 |

## Similar Products

- [Sig Sauer P320-M18 9mm 3.9in Coyote](https://gunsnation.com/p/sig-sauer-p320-m18-9mm-3-9in-coyote/UCE3nOzzv)
- [Sig Sauer P320 M18 9mm 3.9in Coyote](https://gunsnation.com/p/sig-sauer-p320-m18-9mm-3-9in-coyote/UCE3nP5AU)
- [SIG Sauer M18 9mm 3.9in Black](https://gunsnation.com/p/sig-sauer-m18-9mm-3-9in-black/UCE3nP10h)
- [Sig Sauer M18 9mm 3.9in Black](https://gunsnation.com/p/sig-sauer-m18-9mm-3-9in-black/UCE3nOzzo)
- [Sig Sauer P320 9mm 3.9in Black](https://gunsnation.com/p/sig-sauer-p320-9mm-3-9in-black/UCE3nP0u5)
- [Sig Sauer M18 9mm 3.9in Coyote Tan](https://gunsnation.com/p/sig-sauer-m18-9mm-3-9in-coyote-tan/UCE3nP5AE)

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*Data from [GunsNation](https://gunsnation.com)*