The Sig P220 is the handgun that started everything for modern-day Sig Sauer.

Then you have the Legion platform, which has been designed to provide a pistol a notch better than the original.

Put those two together, and you get one of the best 10mm pistols currently available.

This left us wondering why Sig went to the trouble. After all, 10mm pistols aren’t new, but they also aren’t all that popular.

To answer the question, we decided to write this Sig P220 LEGION 10mm SAO review.

In it, we will explore the top features of the P220 Legion.

We’ve included the pros and cons, and the main reasons why you might want one of these beauties. After all, Sig produces some of the best firearms on the market.

So, if they went through the trouble of creating a new 10mm, the least we could do is give it a shot.

When 10mm pistols first hit the scene, many of them simply couldn’t handle the power.

They tended to fail, often permanently. So did the wrists of many new shooters trying to handle the heavy recoil.


This is what led to the .40 S&W cartridge. This was brought about for rookie shooters unable to handle the 10mm recoil.

However, things have changed over the years.

The P220 is one of the most iconic pistols made by SIG Sauer.

It’s a single-stack hammer-fired gun, and for years, it was the only choice in the venerable P-series if you wanted to shoot .45 ACP.

As large-caliber enthusiasts are wont to do, though, they asked if the P220 could shoot an even larger cartridge.

The chambering of choice was 10mm Auto. SIG made the prospect of a P220 10mm even better when the Legion series expanded to include that variant in 2017, introducing the SIG Sauer P220 Legion in 10mm.

Invented in the 1980s the 10mm Auto was briefly adopted by the FBI. While the ballistics of the round were attractive, it proved difficult to train with and shoot well because of its powerful recoil.

Pistols chambered in 10mm also tended to be quite large, difficult to operate for shooters with smaller hands.

Even so, the caliber has a cult following.

In 2007, that led the SIG specialty gunsmith Bruce Gray and his shop, Grayguns, to convert a small number of P220s to 10mm.


If you weren’t one of the lucky few, you had to wait until 2015, when SIG announced that the P220 would become commercially available in 10mm.

The Legion series was launched in late 2015 with SIG’s classic P226 and P229 pistols and added a number of the most in-demand performance upgrades for the guns.

They’re factory guns at factory prices, but are built more like highly customized pistols that have upgraded triggers, sights, grips and more.

The SIG Sauer P220 Legion ships in a plastic hard case with what you’d usually expect: manual, flyers, stickers, gun lock and three eight-round magazines.

It comes in the classic traditional double/single action with decocker (although a single-action only version is available in .45 ACP).

A soft-sided case with custom foam cutouts and a challenge coin are available for free after registering the pistol with SIG.

I was immediately impressed by how well the gun fit my small hands, thanks to the reduced beavertail and trigger guard undercut common to all Legion pistols.

I had no trouble reaching the Grayguns-designed P-SAIT trigger, even in double-action mode.

The decocking lever and magazine release were operable with the same adjustments I make with all pistols, but I did find the slide release very stiff.

I appreciated that both the decocking lever and slide release are low-profile versions, so they didn’t cut into my hands while shooting.

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