Range Report: SIG P320 AXG Legion — A Diehard Accuracy Buff’s Dream

Bob Campbell shooting a SIG Sauer P320 AXG Legion 9mm semi-automatic handgun topped with a Trijicon SRO red dot sight

I did not warm up to the SIG P320 as quickly as some. My son is a military officer and oversaw his unit’s transition to the M17. Overall, the pistol performed well. However, the M17 isn’t quite a P320. I have fired the P320 in testing with uniformly good results. Personally, I simply had other types in long service.

Recently, I have become more interested in striker-fired, competition-grade pistols. Easily, my favorite among these types is the SIG P320 AXG Legion. Let’s cut to the main attraction, the pistol features an integral, two-port, expansion chamber-type, compensator. After enjoying excellent results with the similar setup on the SIG P365 XMACRO, I looked forward to working out this handgun.

SIG Sauer P320 AXG Legion 9mm semi-automatic pistol, left profile
The P320 AXG Legion is a well-made, reliable, and accurate handgun.

Legion Features

Diehard accuracy buffs, and those engaging in amateur competition, will find the P320 AXG Legion to be a fine choice. As a matter of interest, the pistol’s ports are .24 x .66 inch, with a good portion of the slide being devoted to the compensator. The compensator also adds .9-inch to the muzzle. The weight and recoil damping qualities should add up to an easy-shooting pistol, or so I thought. I was not disappointed.

A key feature of this pistol is its metal frame. The pistol is fitted with an aluminum receiver. The pistol features G10 grip panels — among its best features — and an oversized magazine guide.

The frame may not fit every P320 holster. The accessory rail for combat lights is the same as the polymer-frame P320, while the trigger guard is squared off. The grips and frame texture result in an excellent balance of abrasion and adhesion.

The hand rides high on the frame allowing a shift to a lower bore axis. The pistol is well designed with excellent hand fit. If I don’t have good hand fit, nothing else matters in fast, accurate shooting. The magazines are especially well fitted and finished. Capacity is 21 rounds. These feed devices are not difficult to load.

The P320 trigger is often praised as light, crisp, and clean, breaking with a rapid reset. The Legion’s trigger is wider than a P320 and conducive to good control with clean break. This is a single-action trigger, not a double-action-only like the Glock. Keep your finger off the trigger until you are ready to fire — not when you think you will fire, but when you fire.

SIG Sauer P320 AXG Legion 9mm semi-automatic handgun, right quartering profile
This is an extraordinary pistol from a respected maker.

Compression is a light 4.9 pounds and consistent from press to press. Reset is as important as the trigger break in fast shooting. The trigger is well designed for rapid fire and getting hits as quickly and accurately as possible. The slide features well-designed forward and rear cocking serrations.

The P320 Legion features SIG night sights — a nice touch on a 9mm pistol that will double for carry and home defense use. The pistol is optics ready, an option I will cover soon. The P320 uses the very easy to manipulate SIG take down lever. Maintenance is simple. The pistol gets a big ‘R’ for reliability and a little ‘m’ for maintenance.

P320 AXG Legion Specifications

Model: 320AXGF-9-LEGION
Caliber: 9mm Luger
Capacity: (3) 21-round steel magazines
Sights: X-RAY3 day/night sights
Length: 8.2 inches
Width: 1.6 inches
Height: 5.5 inches
Barrel length: 3.9 inches
Weight: 36.1 ounces (unloaded)
Sight radius: 5.9 inches
Frame: Aluminum
Finish: Legion Gray
Sights: SIG XRAY

The magazine release is positive in operation. The pistol features an ambidextrous slide lock. Overall, the Legion gray pistol is an attractive and purposeful handgun that is well balanced. With a 3.9-inch barrel, the P320 Legion is just over 8 inches long and 1.6 inches wide. I was surprised to find the pistol weighs a solid 37 ounces with an unloaded magazine. It feels lighter due to the pistol’s balance.

SIG Sauer P320 AXG Legion 9mm semi-automatic dust cover and barrel
That barrel is 4.9 inches long. However, the configuration makes it look stubby.

This weight will limit recoil. I don’t consider the 9mm Luger a difficult cartridge to control. Just the same, when running at high speed and getting hits as quickly as possible, the P320 is a great performer. As for personal-defense shooting, there is a deft dynamism of people in a stressful situation that is cultivated by those who train and practice hard. The P320 Legion will let you be all you can be.

I have fired the pistol with iron sights. It seems appropriate to add a modern red dot sight (RDS) to the test fire. I began at the top of the heap with a Trijicon SRO. The Specialized Reflex Optic features a larger window than most RDS types, as the SRO was designed specifically for handgun use.

The Trijicon is a versatile RDS, with excellent clarity and a wide range of settings. With 8 settings, and an easily adjusted dot, the SRO is a viable RDS for many uses. During the test fire, I drew the pistol from a Galco Belt Slide — the only holster I had on hand for the SIG Legion 9mm. Speed to an accurate first shot hit was excellent.

Trijicon SRO red dot sight mounted on a SIG 9mm pistol
Trijicon’s RDS provided good results on the SIG P320 AXG Legion.

Trijicon SRO Specifications

  • Maker: Trijicon
  • Model: SRO (Specialized Reflex Optic)
  • Magnification: 1x
  • Sight Window: .98 x .89 inch
  • Lens: Tempered glass
  • Adjustments: 1 click = 1 MOA
  • Adjustment Range: 150 MOA total travel
  • Dimensions: 2.2×1.3×1.4 inches
  • Weight: 1.6 ounces (with battery)
  • Illumination Source: LED powered by CR 2032
  • Battery Life: Over 3 years of continuous use when used at 70 degrees Fahrenheit and at setting 4 out of 8.
  • Brightness Settings: Automatic and adjustable 8 setting

I began at 5 and 7 yards, before progressing to multiple targets at 10 yards. Most of the ammunition expended was American Eagle 124-grain 9mm, with some Blazer 115-grain as well. Speed to an accurate first-shot hit was excellent. Draw, keep both eyes open, and lead the dot to the X-ring as you press the trigger. Speed and accuracy were excellent.

Follow-up shots were particularly quick. The compensator clearly works as intended. While designed as a competetion gun and a range piece, I have carried larger guns concealed. In home defense use, with a combat light added, you’ll have a formidable home defender with a good reserve of ammunition.

A takeover gang with a day pass from Hell may be a formidable threat. The SIG P320 AXG Legion is a good counter strike. I fired the pistol at ranges to as long as 25 yards with excellent results. I slowed down (only a little) at 25 yards and continued to turn in excellent groups.

Accuracy Testing


Group (Inches)

Federal 124-grain Hydra-Shok2.0
Federal 124-grain HST1.5
Federal 147-grain HST1.1
Speer 124-grain Gold Dot1.5
Federal 124-grain American Eagle2.1
Federal 147-grain American Eagle2.0
5-shot groups fired from a benchrest at 25 yards



Velocity (FPS)

Group (Inches)

Nosler 115-grain JHP/Titegroup1,1142.25
Hornady XTP 124-grain/Titegroup1,1401.5
Hornady XTP 124-grain/WW 2311,1501.6
Hornady XTP 147-grain/Titegroup880.9
5-shot groups fired from a benchrest at 25 yards

As for absolute accuracy, I am getting used to the trigger that is quite different from most striker-fired guns. I fired the accuracy groups with the dot at its lowest setting, from a solid rest at 25 yards. A one-inch group versus a two-inch group may not mean that the load is twice as accurate as the other load, but it certainly gave a good showing that day.

I enjoy firing for absolute accuracy, although it may not mean that much as far as personal defense goes. However, it shows a lot about the pistol’s fitting and accuracy potential. I think the SIG P320 AXG is in many ways in a class by itself.

What do you think of the SIG P320 AXG Legion? What’s your favorite version of the SIG P320? Share your thoughts in the Comment section.

  • SIG Sauer P320 AXG Legion 9mm semi-automatic, with a Trijicon SRO red dot sight and Inforce weapons light, left profile
  • Trijicon SRO red dot sight mounted on a SIG 9mm pistol
  • Bob Campbell shooting a SIG Sauer P320 AXG Legion 9mm semi-automatic handgun topped with a Trijicon SRO red dot sight
  • Trijicon SRO red dot sight mounted on a handgun
  • SIG Sauer P320 AXG Legion 9mm semi-automatic handgun, left quartering profile
  • SIG Sauer P320 AXG Legion 9mm semi-automatic handgun, right quartering profile
  • Field stripped SIG Sauer P320 AXG Legion 9mm semi-automatic handgun
  • SIG Sauer P320 AXG Legion 9mm semi-automatic dust cover and barrel
  • SIG Sauer P320 AXG Legion 9mm semi-automatic pistol, left profile
  • Porting on the compensator for a SIG pistol
  • SIG Sauer XRAY3 day/night front sight on a gun
  • Sight picture through the Trijicon SRO red dot sight
  • pistol grip treatment on the SIG Sauer P320 AXG Legion 9mm semi-automatic gun
  • SIG Sauer P320 AXG Legion 9mm semi-automatic, with a Trijicon SRO red dot sight and Inforce weapons light, right profile

About the Author:

Wilburn Roberts

When Wilburn Roberts was a young peace officer, he adopted his present pen name at the suggestion of his chief, as some of the brass was leery of what he might write. This was also adopted out of respect for families of both victims and criminals. The pen name is the same and the man remains an outspoken proponent of using enough gun for the job.

He has been on the hit list of a well-known hate group, traveled in a dozen countries and written on many subjects, including investigating hate crimes and adopting the patrol carbine. He graduated second in his class with a degree in Police Science. It took him 20 years to work himself from Lieutenant to Sergeant and he calls it as he sees it.
The Mission of Cheaper Than Dirt!'s blog, The Shooter's Log, is to provide information—not opinions—to our customers and the shooting community. We want you, our readers, to be able to make informed decisions. The information provided here does not represent the views of Cheaper Than Dirt!

Comments (6)

  1. I have purchased the SIG P320 AXG Legion in November last year. Shortly after that added OLIGHT Baldr Pro laser-light combo and Holosun SCS 320 red dot. I am very happy with all the above. It feels way better than anything I tried at the range.

  2. I bought the P320F last year with the Romeo1 Pro red dot from Cabella’s. I’m 83 yoa soon to be 84.
    I need to requalify for LOSA annually for the active-duty course. The course is a PITA considering the mag change at the second stage. I used to qualify with a Colt .45 with a trench sight and had to carry about 5 mags. Now I don’t need to count rounds, carrying three 17 rd mags. The P320F was offered with the Romeo red dot. I sailed through the quals this year. I tend to rush through the stages, formerly having been a competition shooter with a wheel gun. I find it difficult to slooow down.

    Of my many pistols I find the P320 to be excellent in quality with a fantastic trigger, however I did place it in a Wilson Combat lower. My EDC is a S&W Plus 9mm with 147 gr HST.

  3. I’ve got the standard, full size AGX and it’s amazing. Great to shoot and will easily make one ragged hole at 12 yards.

  4. Does the sig 320 legion have the problem the standard 320 I Heard has, accidentally discharge.??

    1. Hey William,
      Early SIG P320 pistols had some reports of firing when dropped. SIG performed a redesign and corrected the issue. Current P320 models, Legion pistols included, are good to go. Thanks for reading!

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