Sig Sauer P320-M18 9mm Compact, Coyote Tan, Optics-Ready, 3.9 in Barrel, 21+1, 3 Mags, Holster & Case
The Sig Sauer P320-M18 is the commercial counterpart to the U.S. military M18 compact sidearm, finished in Coyote Tan with a stainless-steel, PVD-coated slide. This modular P320 variant features a serialized FCU for grip and slide swaps, an optics-ready slide with a removable rear-sight plate, and ambidextrous controls. It comes with two 21-round magazines and one 17-round magazine, a factory case, and an appendix Kydex holster. This example carries the M18A serial prefix associated with the commercial M18 line.
Condition
Overall Condition: Good condition, showing some signs of prior use and handling.
Bore Condition: Good - Clean, well-maintained, minor wear marks.
Bore Rifling: Excellent Rifling - Sharp lands and grooves.
Specific Condition Notes: There are multiple areas of finish loss on the slide. The frame shows scratches. The cover plate for the optics cut is not present.
What’s Included
- Sig Sauer P320-M18 9mm pistol
- 2x 21-round steel magazines (SIG P320; extended; stamped "MADE IN ITALY")
- 1x 17-round steel magazine (SIG P320; flush-fit; stamped "MADE IN ITALY")
- Appendix carry Kydex holster with integrated spare-mag carrier and dual metal belt clips
- SIG Sauer factory hard case (gray)
- Loading indicator with spring (bagged small parts)
Built on the proven P320 platform, the P320-M18 delivers the compact 3.9 in configuration adopted as the U.S. military’s M18, with a Coyote Tan polymer grip module and a stainless-steel slide treated with a durable Coyote Tan PVD finish. The sighting setup is modular; the rear sight is incorporated into the removable rear-sight/optic plate when installed.
The slide is optics-ready and cut for direct-mount compatibility with the SIG ROMEO1Pro pattern. Front and rear cocking serrations provide positive manipulation. The dustcover hosts a three-slot MIL-STD-1913 accessory rail for lights or lasers.
Its modular, serialized fire control unit allows grip and slide swaps within the P320 family. Controls include ambidextrous slide catch levers and an ambidextrous manual safety, with internal striker and disconnect safeties. The pistol uses a curved trigger and striker-fired action.
Capacity is 21+1 with the included extended magazines, and 17+1 with the included flush-fit magazine. The textured polymer grip module offers a secure hold, and the barrel features a loaded chamber indicator witness slot for quick status checks.
Made in the USA and marked with the M18A-prefix serial format, this P320-M18 pairs military-derived configuration with practical features and a robust accessory package.