Sig Sauer P320 M18 9mm
Model: 320CA-9-M18-MS
Sig Sauer P320 M18 9mm
Model: 320CA-9-M18-MS
Full Specifications
About This Firearm
The Sig Sauer P320 M18 is a carry-size striker-fired 9mm built for duty use, and it has an MSRP of $699.99. It is the commercial version of the pistol issued across every branch of the US military and adopted as the sidearm of the Marine Corps, in the same coyote tan slide and grip module as the issued gun.
Three magazines come in the box, one 17-round and two 21-round. SIGLITE night sights are fitted and the rear sight plate lifts off, so a ROMEO1 PRO mounts directly to the slide underneath it. The safety is an ambidextrous manual lever, which the standard commercial P320 does not carry, and the thumb pads take the width out to 1.6 inches. The grip module is a carry-size medium in coyote tan polymer.
If you're cross-shopping, the Sig Sauer P320 XCarry shares the 3.9-inch barrel and the flush magazine count at 26.5 oz, with a flat X-Series trigger, no safety lever and a 1.3-inch width against the M18's 1.6. The Glock G19 Gen5 weighs 23.63 oz, holds 15 rounds on a 4.02-inch barrel, and has no optic cut in its slide.
Best For
Strengths & Limitations
- The slide and grip module are the same coyote tan as the military version, not a commercial repaint.
- The slide is stainless steel under a coyote PVD finish.
- The serialized part is a stainless steel fire control unit, so a cracked or worn grip module is replaced as a part.
- The three magazines are two different lengths, so a matching set means buying another.
- At 28.1 oz it is heavy for its length, because the steel fire control unit sits inside the grip module.
- The coyote tan finish shows holster wear differently from a black Nitron slide.
Category Rankings
How the Sig Sauer P320 M18 9mm ranks among compact 9mm Luger handguns.
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Frequently Asked Questions
Is this the same pistol the military issues?
It is the commercial version of it. Sig lists the M18 as recently issued to all branches of the US Military and chosen as the official sidearm of the Marine Corps.
Which optic mounts on it?
The slide is optic ready and Sig lists it as directly compatible with the ROMEO1 PRO, with a removable night sight rear plate under the optic.
Can the manual safety be removed?
Sig sells this pistol as a manual-safety model. Buyers who want no lever are looking at a different P320 version.
What size is the grip module?
A carry-size medium, which pairs a full-length grip with the shorter slide.
