Sig Sauer P320 Nitron Review

sig sauer p320 nitron full size 9mm review

The SIG SAUER P320 Nitron Full-Size is a modern, polymer-framed, striker-fired handgun designed and manufactured by SIG SAUER. This product review will cover the various features, specifications, and our opinion of the SIG SAUER P320 Nitron Full-Size.

P320 Nitron Full-Size 9MM

About Sig Sauer, the P320

The Sig Sauer P320 is a semi-automatic pistol manufactured by the Swiss-German firearms company Sig Sauer. It was introduced in 2014 and quickly gained popularity among law enforcement and civilian shooters due to its modularity and reliability.

The P320 was designed to replace the Sig Sauer P250, which was introduced in 2007. While the P250 was a reliable handgun, it had limited modularity and customization options. Sig Sauer addressed these issues with the P320 by designing a modular chassis system that allows users to change the caliber, size, and grip of the pistol without buying a new firearm.

P320 Development

The development of the P320 began in 2012 and was officially introduced to the public in January 2014 at the SHOT Show in Las Vegas. Firearms enthusiasts received the pistol well, and it rapidly gained a reputation as a reliable and versatile handgun.

In 2017, the P320 gained international attention when the US Army selected it as its new service pistol, replacing the Beretta M9. They selected the P320 following a rigorous testing process that involved assessing its durability, accuracy, and compatibility with various ammunition types.

P320 Recall

However, the P320 encountered a setback in 2018 when they discovered that the handgun had a defect that could cause it to discharge if dropped at a particular angle.. This led to a recall of all P320 pistols, and Sig Sauer quickly addressed the issue by fixing the defect and providing a free upgrade to all affected customers.

Despite this setback, the Sig Sauer P320 remains a popular handgun among law enforcement and civilian shooters. Its modularity and reliability continue to make it a top choice for those in the market for a new gun.

How the P320 Nitron Arrives

Upon receiving the box, you’ll first notice the Sig Sauer logo on the top of the Gray hard carry case, which has two lock holes located towards the back of the handle. They construct the box out of robust hard plastic and fashion it to securely hold the gun and all its accessories. Once you open the box, you’ll find the P320 Nitron Full-Size 9mm lying in foam, a lock,two2 magazines, and an operator manual with warranty information.

Sig Sauer P320 Design and Build

Sig Sauer magazine and handgun

The striker-fired SIG SAUER P320 Nitron, 9mm Full-Size, has a sleek and modern design, with a polymer frame and a stainless-steel slide finished in Nitron. The polymer frame is lightweight and easy to handle, making it an excellent choice for extended periods of use

The modularity of the Sig Sauer lends itself to switching out almost every aspect of the handgun easily.

Compact vs Nitron Size comparison
Nitron -VS- Compact Size Comparison

P320 Nitron Specifications

  • SKU: 320F-9-B
  • CALIBER: 9mm Luger
  • MAGS INCLUDED: (2) 17rd Steel Mag
  • SIGHTS: Steel 3-dot Contrast Sights
  • PISTOL SIZE: Full-Size
  • OVERALL LENGTH: 8.0 in (203 mm)
  • OVERALL WIDTH: 1.4 in (36 mm)
  • HEIGHT: 5.5 in (140 mm)
  • BARREL LENGTH: 4.7 in (119 mm)
  • WEIGHT: 29.5 oz (836 g)
  • SIGHT RADIUS: 6.6 in (168 mm)
  • TRIGGER TYPE: Standard Curved
  • GRIP TYPE: Modular Polymer
  • BARREL MATERIAL: Carbon Steel
  • FRAME MATERIAL: Stainless Steel
  • SLIDE FINISH: Nitron
  • SLIDE MATERIAL: Stainless Steel

P320 Grips

Sig Sauer p320 Grip

They ergonomically design the grip, incorporating interchangeable backstraps to personalize the fit to the shooter’s hand. Although I found the grips very comfortable and a great fit, Sig does offer a wide variety of Grip Modules to fit many tastes and configurations.

There are several aftermarket options as well.

  • AB Prototype
  • GrayGuns- Laser-Sculpted Grip Modules
  • Wilson Combat- WCP320 Modules

These are just a few;; I’ll update the list as I find others.

Picatinny Front Rail

The P320 Nitron Full-Size has a Picatinny rail for attaching accessories such as lights or lasers.

Some of our favorite options are.

  • Olight Baldr Pro 1350, PL-Pro Valkyrie
  • Streamlight TLR-1 HL7A, TLR-7, TLR-8A 
  • Surefire X300

Regarding rail-mounted lights and lasers, we plan to write a separate blog post in the coming weeks to cover the many options and related pros and cons.

Sig P320 Slide

Sig Sauer P320 slide
Left side slide
P320 right side slide
Right side slide
Top view P320 Slide
P320 Slide- Topview

They coat the stainless-steel slide in Nitron, which offers exceptional corrosion resistance and durability.

The slide features front and rear serrations, making it easy to manipulate for reloading or clearing malfunctions. The slide also has Steel 3-dot Contrast Sights, which provide excellent low-light visibility and a sight radius of 6.6 inches.

Trigger and Safety

The P320 Nitron Full-Size features a striker-fired trigger system (a change from the pre-2014 models), which provides a smooth and consistent trigger pull. They design the trigger to deliver a short and crisp reset, enabling you to take faster follow-up shots. The trigger has a pull weight of approximately 5.5 pounds, which is suitable for most users.

I find the trigger a bit heavier than my preference, and it has a crisper break than I am accustomed to. The travel and reset are great, but because I like my triggers lighter with a softer break, I will likely be changing out the trigger. My first choice for most trigger upgrades is Apex.

The P320 Nitron Full-Size has a three-point takedown safety system. The three-point takedown safety system guarantees that you cannot disassemble the firearm without removing the magazine and clearing the chamber. This feature prevents accidental discharges.

Magazines and Capacity

P320 9MM magazine

The P320 Nitron Full-Size comes with two magazines, which have a capacity of 17 rounds of 9mm. They manufacture magazines out of steel, and they are designed to be durable.

Other available Magazines from Sig Sauer Include,

P320-M17/M18 9MM 17RD Coyote Magazine
P320-M17/M18 9MM 21RD Coyote Magazine
P320 9MM 30-Round Extended Magazine

Also, a range of aftermarket magazines is available.

Accuracy and Reliability

Shooting the P320 was as expected, the ergonomic design makes this firearm comfortable and fun to shoot. After a bit over 400 rounds, it ran flawlessly for me. The 3-dot sights worked perfectly and provide excellent low-light visibility, allowing accurate shots in most lighting conditions. Keep in mind, although I do have handguns with red dot sights, I prefer iron 3 dot iron sights myself, and this P320 doesn’t come stock with an optic-ready slide.

I found it easy to see why the SIG SAUER P320 Nitron Full-Size has earned a reputation as a reliable, accurate, and durable firearm suitable for personal defense and law enforcement applications, during this review.

Sig Sauer P320 Nitron FAQs

Is the P320 Nitron 9mm reliable?

The P320 Nitron 9mm is considered one of the most reliable pistols on the market. It has undergone extensive testing and is currently used by military and law enforcement agencies.

What is the price of the P320 Nitron 9mm?

The price of the P320 Nitron 9mm varies depending on the dealer and location, but it typically ranges from $500 to $700.

What is the difference between the P320 Nitron and P320 Compact?

The main difference between the P320 Nitron and P320 Nitron Compact is the size. The P320 Nitron Compact has a shorter barrel and slide length, making it more compact and easier to conceal.

Is the P320 Nitron 9mm easy to maintain?

Yes, the P320 Nitron 9mm is relatively easy to maintain. It disassembles quickly and can be cleaned with standard cleaning supplies. However, it is always important to follow proper maintenance procedures to ensure the longevity and reliability of the firearm.


  • Michael Hodgdon

    A firearm, shooting, outdoor and hunting enthusiast on and off a better part of my life. Writing about something I enjoy so much just sounded like a good idea. That being said, I am most definitely not a good writer, so feel free to point out my typo's, grammar mistakes and misspellings:) Two came up in spellcheck when I typed this bio.

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