SIG Sauer P320 M18 Compact 9mm – Coyote PVD Slide, Night Sights, Modular FCU, 21+1 Rounds
Built for the U.S. Armed Forces and now available to civilians, this 2022-manufactured SIG Sauer P320 M18 delivers duty-grade performance in a compact package. Its serialized fire-control unit lets you change calibers and grip modules, while the coyote PVD slide and matching polymer frame mirror the military issue look. A 3.9-inch stainless barrel, SIGLITE tritium night sights, and an optic-ready slide add practical versatility that appeals to defensive shooters and collectors alike.
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.
Rifling Condition: Excellent – sharp lands and grooves.
Specific Condition Notes: There are a few light scratches and small blemishes on the slide and frame, but the firearm remains mechanically sound and well cared for.
What’s Included
- SIG Sauer factory hard case (gray)
- 1× 21-round steel magazine with coyote polymer base pad
- 1× 17-round steel magazine with coyote polymer base pad
The P320 M18 is the commercial counterpart to the U.S. military’s standard-issue sidearm, retaining the same ambidextrous manual thumb safety and striker-fired action for consistent, duty-ready handling.
Its coyote PVD-finished stainless slide features front and rear cocking serrations and an optic cut compatible with Leupold DeltaPoint Pro and SIG Romeo1Pro footprints. A removable plate protects the cut when a red dot is not installed.
SIGLITE tritium 3-dot night sights provide a clear, dependable sight picture in low light, and the sight assembly is mounted on the optic cover plate so point of aim remains consistent when an optic is added.
The serialized, stainless steel fire-control unit forms the heart of SIG’s modular system, allowing easy swaps between calibers, frames, and slide lengths. Paired with a compact coyote polymer grip and a 3.9-inch stainless barrel, the M18 balances shootability with carry-friendly dimensions.
Two high-capacity magazines—one 21-round and one 17-round—maximize firepower, making this M18 well suited for home defense, duty carry, or range use.