Sig Sauer proudly calls the P320 the “world’s most innovative handgun.” While the P320 is Sig’s first polymer-framed, striker-fired handgun, it’s the modularity that really stands out. There’s an almost unlimited number of ways to configure a Sig Sauer P320 – more about that later. 

Models even range from compact to full size and offer a variety of finishes and features. As one of the few similar-sized polymer-framed pistols to truly challenge the Glock 19 for popularity, it’s worth checking out why so many people love this handgun.

Why So Much Love for the P320?

The answer is really pretty simple – versatility, modularity, reliability, and accuracy. The P320 is loved by many competitive shooters and concealed carriers. Beyond that, it’s earned a place with many law enforcement agencies, and a special version was even adopted by the U.S. military.

It’s easy to see why. You can basically design the handgun of your dreams with a P320 given the many ways you can customize the gun. To the uneducated eye, the P320 may seem like just another handgun available in a few different models and color options. But every single one has the potential to be completely unique. 

To highlight what makes this pistol so popular, I’ve picked three things to love about the Sig P320 and outlined them below. As you’ll see, the P320 is anything but just another handgun. 

‘Unmatched Modularity’

Again, those are Sig’s words, but I’ve got to hand it to them. The gun is remarkably modular. Integrated into the design of the P320 is the ability to change out your frame, which is available in small, medium, and large. Now I’m not talking about changing out your backstrap or a small enhancement to your grip. This is the entire grip frame. 

This means you can go from a full-size frame to a compact carry frame in just a few easy steps. Think that’s cool? The innovation doesn’t stop there. With readily available conversion kits, you can also change the slide length, barrel, and/or caliber of the handgun! 

That’s right, you can buy the 9mm and convert it to a .40 S&W, .357 SIG, and even a .45 ACP. And those different frame sizes I mentioned earlier? Yeah, they work with the conversion kits, too. The secret is in their removable Fire Control Unit, or FCU, which acts a lot like a drop-in trigger unit and functions with all of the conversion kits, barrels, frames, etc. The FCU is the serialized part of the gun, functionally making it the “firearm” in a legal sense.

P320 FCU on a display stand
The FCU is the serialized part of the pistol. (Photo: Paul Peterson/
Sig Sauer P320 Fire Control Unit on a display stand
It can be easily removed from the pistol frame. (Photo: Paul Peterson/

Battle Tested

Sure, the M17 and M18 variants that the U.S. military adopted aren’t exactly the standard P320, but they’re pretty darn close. What I love is that this handgun platform has been so thoroughly vetted by the military that it passed extensive testing and beat out other major applicants like the Beretta APX, Glock 19X, and the FN 509. They’re all great guns, but the P320 came out on top. You just can’t go wrong. 

Our military doesn’t take changing their sidearm lightly. In fact, the last one – the Beretta M9 – was in service for over three decades. To make the final cut after all the torture testing and thousands of rounds downrange means the P320 is extremely accurate and reliable even under the harshest conditions. 

The P320-based M17 and M18 are currently being adopted by not only the U.S. Army, but the Air Force, Navy, Marine Corps, and Coast Guard. Hey, if It’s good enough for the U.S. military, it’s good enough for me.

Easy Takedown & Maintenance

Sig Sauer P320 Fire Control Unit in a woman's hand outside
The pistol is easy to completely disassemble. (Photo: Taylor Abney/

Safety first, right? The takedown procedure on the P320 is one of the easiest on the market. What I love is that it doesn’t require a trigger pull to disassemble like some striker-fired pistols. It’s always safer to not have to touch the trigger during the takedown of a handgun. 

Lock the slide back, drop the magazine, rotate the takedown lever, release the slide, and pull it off the frame. No tools, no springs flying across the room, no parts getting lost on your table, and – most importantly – no trigger pull. What’s not to love. Reassembly is just as fast and easy.

On top of that, the fact that you can easily remove the FCU makes cleaning, maintenance, repairs, and upgrades a cinch. That’s one of the reasons the military wanted a modular handgun in the first place. 



All in all, the Sig Sauer P320 is an incredible handgun. I’ve only outlined three of its many great features, but there’s so much more to love about this gun. From its smooth trigger pull to the integrated accessory rail, there’s a lot more to love about this gun in all its various forms. With truly endless possibilities because of the modularity, odds are you’ll never get bored with this gun. If you do, just change it to suit your desires. 

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