The P320 is a modular design. You may change the grip frame and slide around the serialized metal chassis as well as exchange the grip frame for larger or smaller units. Institutional users can keep a few sets in stock to fit all hand sizes. The rest of us will be careful when we order.
- The test gun came with the medium grip, full-size frame, which seems to suit most shooters across the board.
- The SIG weighs 29.5 ounces (unloaded) and has good balance.
- The slide has a Nitron finish and features forward cocking serrations, which offer sufficient purchase for manipulation.
- The controls include a slide lock, magazine release and take down lever.
- The SIG magazine release is a trapezoid shape. I had the impression of pressing forward as well as in with this release. It is a good feature of the P320.
- Field strip is simple enough, using a takedown lever. The pistol does not have to be decocked for disassembly, a plus.
- The grip frame is pebbled on the front strap, back strap and each side in the same pattern. It worked well for the author and other shooters.
- Magazine capacity is 17 rounds. There are grooves in the handle to allow a strong grasp on the magazine in the event of a stuck magazine—which isn’t likely to occur.
- Trigger compression is consistent at 7.75 pounds. While classed as a double-action only trigger, it behaves more like a single-action trigger. The more you use this trigger, the more you appreciate it. You can accomplish good shooting with this action.
- The sights are steel in the popular 3-dot white outline design. The SIG sights are dovetailed in place both front and rear.
- Two magazines accompany the SIG along with a plastic range holster.
- The pistol came on target quickly.
- Fast recovery was the rule.
- Trigger compression is short and reset fast.
- Trigger travel is about .4 inch.
- There were no failures to feed, chamber, fire, or eject.
- The SIG P320 is comfortable to fire.
- In combat drills, the SIG P320 made a good showing.
- In absolute accuracy, the pistol exhibited an average of two to three inches in accuracy with different loads.
Like all quality handguns, the SIG prefers one load to the other at long range, when firing for absolute accuracy. However, at seven yards the pistol put all of the rounds in the magazine into one hole.
At 15 yards, a bit longer than the average engagement range, the SIG P320 put five rounds of practically any service load into a two-inch group.
I was able to test fire the SIG extensively. I moved to a heavyweight load preferred by many shooters.
- The Fiocchi 147-grain Extrema proved accurate, reliable and with less felt recoil than the 115-grain load. This loading penetrates deeply and expands modestly.
- I also used the Winchester 115-grain JHP in the Personal Defense line. Affordable but effective, this loading is fast enough to ensure expansion.
- I also fired a quantity of the Winchester 115-grain Silvertip, a proven defense loading.
All loads were reliable and gave good accuracy.
SIG modified the basic design of the hammer-fired SIG P250 in the SIG P320. In my estimation, the new pistol exhibits a faster lock time, a smoother trigger action and greater practical accuracy.
The P320 is light enough while offering service grade accuracy. For those preferring ease of maintenance, a simple operating mechanism, and SIG reliability in worst-case scenarios the P320 is an excellent choice.
The SIG P320 is a solid handgun, reliable, accurate and rugged enough for duty. The reserve of ammunition is good and the pistol will handle most emergencies in trained hands.
Do you have a SIG P320? Do you agree with the author’s review? Why, or why not? Share in the comment section.
Bob Campbell is a former peace officer and published author with over 40 years combined shooting and police and security experience. Bob holds a degree in Criminal Justice. Bob is the author of the books, The Handgun in Personal Defense, Holsters for Combat and Concealed Carry, The 1911 Automatic Pistol, The Gun Digest Book of Personal Protection and Home Defense, The Shooters Guide to the 1911, The Hunter and the Hunted, and The Complete Illustrated Manual of Handgun Skills. His latest book is Dealing with the Great Ammo Shortage. He is also a regular contributor to Gun Tests, American Gunsmith, Small Arms Review, Gun Digest, Concealed Carry Magazine, Knife World, Women and Guns, Handloader and other publications. Bob is well-known for his firearm testing.
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