Sig Sauer P320 M18 MS 9mm Coyote-Tan Night-Sight Optic-Ready 21+1 Semi-Auto Pistol
The P320 M18 MS is the commercial counterpart to the U.S. military’s M18 Modular Handgun System, delivering duty-grade performance in a compact, civilian-legal package. Finished in the same coyote-tan PVD as the service pistol and built around Sig’s modular, stainless-steel fire-control unit, this striker-fired sidearm offers ambidextrous controls, night sights, and an optic-ready slide while accepting 21-round magazines—all in a 3.9-inch-barreled platform.
Condition
Overall Condition: Very good condition, showing only light, superficial signs of prior handling or use.
Bore Condition: Excellent – Clean, mirror finish, no signs of wear.
Bore Rifling: Excellent Rifling – Sharp lands and grooves.
Specific Condition Notes: Minor superficial scratches and blemishes are present on the exterior surfaces, but the bore remains clean and shiny.
What’s Included
- SIG Sauer factory gray hard case with molded SIG logo
- SIG Sauer safety/owner’s manual
- Yellow M18 fabric patch
- 2 × 21-round factory SIG Sauer steel magazines with coyote polymer baseplates (Made in Italy)
- 1 × 17-round factory SIG Sauer steel magazine with coyote polymer baseplate (Made in Italy)
Designed to mirror the military M18, this pistol features a coyote-tan PVD slide with both front and rear serrations plus a removable cover plate for direct-mount optics compatibility. The matching polymer grip module provides a consistent, non-reflective finish and houses the serialized fire-control unit marked “M18-056498,” allowing caliber or size changes within the P320 family.
Fully ambidextrous external controls—including the manual thumb safety, slide catch, and reversible magazine release—make the M18 MS suitable for right- or left-handed shooters and simplify weapon-handling drills. The curved, striker-fired trigger maintains a clean break and short reset for predictable, repeatable performance.
Factory SIGLITE tritium night sights deliver a clear sight picture in low-light conditions, while the 3.9-inch carbon-steel barrel with a 1:10 twist optimizes accuracy and velocity for 9mm duty loads. A molded accessory rail supports white-light or laser modules without aftermarket adapters.
High-capacity steel magazines—two 21-rounders and one flush-fit 17-rounder—provide ample on-board ammunition, matching the U.S. military specification and giving the shooter flexibility for duty, training, or concealed-carry roles.