Sig Sauer P320 Full-Size Nitron 9mm Striker-Fired Pistol – 4.7" Barrel, Modular FCU, 17+1
The Sig Sauer P320 Full-Size Nitron stands out for its fully modular fire-control unit, the same core design selected for the U.S. Army’s M17/M18 program. This 9mm variant pairs a 4.7-inch carbon-steel barrel with a black Nitron-finished stainless-steel slide and a matte-black polymer frame. A flat-faced, skeletonized trigger and full-length Picatinny rail round out a package built for straightforward adaptability and reliable duty performance.
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 Rifling - Sharp lands and grooves.
Specific Condition Notes: Only faint handling marks are visible on the slide and grip; the bore is bright and free of fouling.
What’s Included
- SIG Sauer factory plastic pistol case
- Two 17-round SIG Sauer steel magazines
- SIG Sauer P320 owner's manual
The serialized stainless-steel fire-control unit (FCU) is the heart of the P320 system, allowing caliber and grip-module swaps without requiring an FFL transfer. This gives owners the flexibility to configure the pistol for duty, competition, or concealed carry by simply changing slide or frame assemblies.
Its striker-fired action uses a double-sear safety, striker safety plunger, and disconnect safety—providing multiple internal safeties without the need for an external manual lever. The flat-faced, skeletonized trigger delivers a consistent pull and quick reset favored by many shooters.
The full-size platform combines a 4.7-inch barrel with a 17+1 capacity, offering a balance of sight radius and magazine capacity that suits both service and range use. Front and rear slide serrations aid manipulation, while the durable Nitron finish resists corrosion and wear.
A full-length Picatinny rail on the dust cover allows simple attachment of lights or lasers. The reversible magazine release supports left- or right-handed shooters, and the three-dot sights provide a clear, fast picture in varied lighting conditions.