SIG Sauer P320 M18 9mm Compact, Manual Safety, 3.9 in Barrel, Optics-Cut Slide - Excellent
This SIG Sauer P320 M18 stands out with its compact 3.9 in slide on a carry-length grip, ambidextrous manual thumb safety, and optics-cut slide with cover plate using the SIG PRO footprint. It is a striker-fired, polymer-frame 9mm finished in black with a stainless-steel slide, and it comes in excellent condition. This example includes five factory-compatible magazines along with the SIG factory case, manual, and an M18 patch.
Condition
Overall Condition: Excellent condition, showing only faint signs of any prior use or handling.
Bore Overall Condition: Excellent - Clean, mirror finish, no signs of wear.
Bore Rifling: Excellent Rifling - Sharp lands and grooves.
Specific Condition Notes: This firearm shows only very minor, superficial scratches and blemishes from light handling.
What’s Included
- SIG SAUER factory hard case (gray)
- SIG SAUER manual and paperwork
- SIG SAUER M18 patch
- Five steel double-stack magazines: 2x 21-round and 3x 17-round; mix of flush-body and extended bases; magazine bodies marked Made in USA and Made in Italy
The P320 M18 configuration pairs a compact-length 3.9 in slide with a carry-length grip, delivering a balanced profile with strong capacity support. It is striker-fired and features an ambidextrous manual thumb safety, giving the user consistent controls with either hand. The frame is polymer with molded texturing, and the overall finish is black.
The slide is stainless steel with a black finish and includes front and rear cocking serrations for confident manipulation. It is optics cut and fitted with a cover plate, using the SIG PRO footprint. A 3-slot M1913 accessory rail on the dust cover supports common lights and accessories.
Sights are fixed, with a front blade carrying a single dot and a rear square-notch marked with height code 8. The sight radius measures 5.8 in, contributing to clean sight alignment in a compact package.
Magazine capacity is listed at 21+1, and this example ships with five steel, double-stack magazines: two 21-round magazines and three 17-round magazines. The mix of flush-body and extended base designs provides flexibility for carry and training.
Controls include a left-side magazine release and ambidextrous manual safety. The slide is marked NEWINGTON, NH, USA. The factory case label is dated 19-FEB-2021, and the manufacturer part number is W320CA-9-M18-MS-BLK.