SIG Sauer Pistols
SIG Sauer M18
Specs, variants & prices
SIG Sauer currently makes 5 versions of the M18 pistol, all chambered in 9mm Luger. Each has a 3.9" barrel. Of the 5 versions, 3 are milled for Leupold DeltaPoint Pro-pattern dots; one uses SIG's SIG-LOC optic mounting system, with a factory ROMEOM17 With SIGLITE Front/Rear installed; and one is optics-ready. SIG Sauer's suggested retail prices run from $699.99 to $1,429.99, and stores set their own prices from there. The table below lines up every version so you can compare them at a glance.
What versions of the SIG Sauer M18 are there?
5 current versions. Specs and measurements are SIG Sauer's own.
M18
1x 17rd, 2x 21rd magazines
- Optics
- DPP cut
- Model / part #
- M18-9-CSS-MS
- Caliber
- 9mm Luger
- Capacity
- 17/21
- Barrel
- 3.9"
- Overall length
- 8.0"
- Weight
- 28.1 oz
- Finish
- Coyote M17 PVD
- MSRP
- $699.99
- CA
- —
- MA
- —
M18
3x 10rd magazines
- Optics
- DPP cut
- Model / part #
- M18-9-CSS-MS-10
- Caliber
- 9mm Luger
- Capacity
- 10
- Barrel
- 3.9"
- Overall length
- 7.2"
- Weight
- 28.1 oz
- Finish
- Coyote M17 PVD
- MSRP
- $699.99
- CA
- —
- MA
- —
M18
3x 10rd magazines
- Optics
- DPP cut
- Model / part #
- M18-9-CSS-MS-MA
- Caliber
- 9mm Luger
- Capacity
- 10
- Barrel
- 3.9"
- Overall length
- 7.2"
- Weight
- 28.1 oz
- Finish
- Coyote M17 PVD
- MSRP
- $699.99
- CA
- —
- MA
- Yes
M18X
3x 21rd magazines
- Optics
- SIG-LOCROMEOM17 With SIGLITE Front/Rear installed
- Model / part #
- M18X-9-RX
- Caliber
- 9mm Luger
- Capacity
- 21
- Barrel
- 3.9"
- Overall length
- 7.2"
- Weight
- 30.8 oz
- Finish
- Coyote PVD
- MSRP
- $1,429.99
- CA
- —
- MA
- —
P320-M18 CALIFORNIA
3x 10rd magazines
- Optics
- Optic-ready
- Model / part #
- 320CA-9-M18-MS-CA
- Caliber
- 9mm Luger
- Capacity
- 10
- Barrel
- 3.9"
- Overall length
- 7.2"
- Weight
- 28.1 oz
- Finish
- Coyote PVD
- MSRP
- $699.99
- CA
- Yes
- MA
- —
What calibers does the M18 come in?
Every current version is chambered in 9mm Luger.
Is the M18 optics-ready?
Of the 5 versions, 3 are milled for Leupold DeltaPoint Pro-pattern dots; one uses SIG's SIG-LOC optic mounting system, with a factory ROMEOM17 With SIGLITE Front/Rear installed; and one is optics-ready.
How much does a SIG Sauer M18 cost?
SIG Sauer's suggested retail prices run from $699.99 to $1,429.99, depending on the version. Tap “See prices” next to any version to see what retailers are asking.
Can you buy one in California or Massachusetts?
According to SIG Sauer, one version is available in California, and one version is available in Massachusetts. Look for “Yes” in the CA and MA columns. State rules change, so check our California and Massachusetts pages before you buy.
What's the latest on the M18?
Nothing new on the M18 lately.
Specs from SIG Sauer, checked October 22, 2026 (source). Spot a mistake? Let us know and we'll fix it. SIG Sauer is a trademark of its owner, listed for identification only. Firearms Almanac isn't affiliated with SIG Sauer.