SIG Sauer P320 Full-Size Nitron BSS 9mm Luger, 4.7" Barrel, SIGLITE Night Sights, 17+1
The SIG Sauer P320 Full-Size Nitron BSS stands out for its modular design, proven striker-fired reliability, and factory-installed SIGLITE night sights. This early commercial BSS package also ships with a factory holster, adding practical value for duty or range use.
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: This P320 shows light finish wear near the muzzle and faint handling marks on the grip module.
What’s Included
- SIG Sauer factory hard case
- Two 17-round steel magazines marked "Made in Italy"
- SIG Sauer polymer paddle holster (OWB)
- SIG Sauer P320 owner’s manual
- Factory cable lock (sealed bag)
The full-size P320 combines a 4.7-inch carbon-steel barrel with a Nitron-finished slide featuring forward and rear cocking serrations and an external extractor. The extended sight radius pairs with factory SIGLITE tritium 3-dot night sights for clear target acquisition in varying light.
At the heart of the platform is SIG’s modular fire control unit, allowing caliber or frame size changes without tools. This model retains the tool-free takedown system that does not require pressing the trigger, enhancing safety during maintenance.
The striker-fired action delivers a consistent break, and the stainless-steel chassis housed in a textured polymer grip module offers a solid feel while keeping weight manageable. A full Picatinny accessory rail accommodates lights or lasers for duty or home-defense roles.
Adopted by the U.S. military as the basis for the M17/M18 series, the P320’s design pedigree speaks to its durability and performance standards. This commercial Nitron BSS variant mirrors those attributes while adding civilian-friendly features such as the included holster and night sights.



