Best Sig Sauer P320 Upgrades: Grips, Comps, Slides, Barrels, & More

P320 CAN BE ANYTHING YOU WANT IT TO BE, BUT WHAT PARTS ARE THE BEST?

Strap in; we got a lot of ground to cover here! The SIG P320 has been around for almost 10 years, and in that time, a lot has changed. From adoption by the US Military as the standard issue side arm to becoming one of the predominant pistol competition platforms, the SIG P320 can do almost anything.

With a huge aftermarket and dozens of options in every flavor and color, it can be hard to find exactly what you want.

We’ll cut through the noise and give you the low down on the best P320 upgrades!

BEST P320 GRIPS

The first stop for upgrading your P320 should be the grip. SIG grips aren’t bad, but for almost every application, you can find something that works at least a little better, depending on your needs and wants.

That said, sometimes the best really is just the factory option.

Wilson Combat

Offering grips for the P320 and the P365 in every size and shape, Wilson Combat is one of the largest producers of grips modules. They also make some of the best.

For simple EDC carry, home defense, or getting started in competition – Wilson Combat grips are inexpensive and really well made. For the value they offer, nothing else can come close.

And they come in multiple colors – Coyote, Gray, OD Green, and Black. They also come in a wide range of sizes, from full-size down to compact. 

The side of the grip is textured, but not aggressively so. This makes it nice to shoot with but it won’t rub a hole in your skin if you carry it IWB.

But when it comes to the front and backstraps, you’ll find some very aggressive grip textures. This really helps control the pistol while shooting and feels nice in your hand.

The grip itself is also recontoured compared to the factory option and, for me, at least, feels a lot more natural. I can also reach the magazine release a little easier, and I really like that.

Every Wilson Combat grip module comes with a magazine release for you to install. Installation is super easy and lets you pick either left or right-handed.

Brouwer Solutions M1811

This grip is a little… odd. But I like it.

If you’re a big fan of the 1911, you’ll probably like this grip module a lot. Designed to mimic a 1911 grip as much as possible, this really does feel almost exactly like an old-school A1. For aesthetics and class, I love this grip. It feels great in my hand, is easy to point, and has a solid feel.

The beaver tail is slightly higher than a normal P320, and this drops your bore axis a little. I can’t say I noticed much of a practical difference, but the grip was very controllable and pointed well. Something I did notice was the enlarged trigger guard. For shooting with gloves, this was one of the best grips to use.

I wish it were more aggressively textured, but I feel that way about most grips. 

While this won’t turn your P320 into 1911, it’s a fun grip that speaks to my soul in a lot of ways. If you’re a huge 1911 fan and want something that feels a little closer to home, I recommend giving the M1811 a try.

Icarus Precision A.C.E. 320 SOCOM Carry

Icarus Precision makes several sizes and styles of their Aluminum grip module, mine was the SOCOM Carry. A Carry-sized frame with a built-in half magwell, double undercut style trigger guard, extended beaver tail, and a 1913 rail under the barrel.

I. Love. This. Grip.

I’ve gotten to shoot a lot of guns, and I’ve honestly never had anything that felt so perfect in my hands. The texture of the grip locks into my palms, the double undercut trigger guard lets me get a high and tight grip, and the mini magwell makes reloads super easy and fast but still lets me use 17-round flush-fitting mags—if I want to.

Something that surprised me is the weight. A standard plastic carry size P320 grip is about 6 ounces, the SOCOM Carry is only 8.45 ounces, and it is made from 7075 aluminum. In terms of ease of carry, that is barely any extra weight. 

If you want it heavier you can add tungsten rods to the inside of the grip.

But now the bad news. This grip isn’t cheap, coming in at $417 for the Fire Bronze or $380 for the black. And, while I love that it is made from Aluminum, that same wonderful metal also acts as a heat sink. I don’t know what it is like to carry this in a cold climate since I spent all my time carrying it in California and Arizona, but I do know on a cold morning this grip can suck the heat out of your hands when you’re doing shooting drills.

End of the world? Nope. Enough to make me like this grip any less? Hell no. But I thought I should mention it. 

In case you’re wondering, the A.C.E. 320 SOCOM is my Editor’s Pick. 

Side note, they’re coming out with a version for the X-Ten, and I am very excited.

Grayguns

When I first opened the Grayguns grips, I admit I was a little unimpressed. In fact, if I’m being really honest—I was downright disappointed. Then I actually took them out for some shooting, and I realized I was totally wrong. To my surprise, I actually really like these grips.

While Wilson Combat and Icrus make their own grips from the ground up, Grayguns takes standard SIG grips and makes them better with lasers. These laser-sculpted versions have a lot more grip in the right places, but not enough aggression to hurt you while carrying. 

The combined result is a grip that feels outstanding. This just goes to show—you shouldn’t judge a book by its cover!

I was so impressed with their take on the SIG TXG grip that I took it to InRangeTV’s Desert Brutality. For more on that take a look. 

L2D Combat

A similar approach to a custom grip, L2D Combat takes standard SIG grips and zaps them with a laser to improve the grip and feel of the module. 

The sides are less aggressive than the Gray Gun version, but the front and back strap is more aggressive. This gives you a fairly comparable amount of controllability but a little less wear on your skin or shirt if you choose to carry it concealed and really close to the body. 

L2D also offers its grips in some cool Cerakote finishes like Alpine Multicam and Dark Splinter Camo. The Cerakote is really well done and looks great.

I like these grips, and if you like the Cerakote options, they make a pretty good choice. The downside is that they come in at $290. That feels a bit steep compared to other options.

That said, custom stippling has gone way up in price over the last few years, and this isn’t totally out of line with that pricing. 

SIG Sauer X5, TXG, & DH3

Some true SIG Sauer grips, these are the cream of the crop from SIG!

The X5 is their newest design with a beefy grip, nice texturing, and the ability to use a tungsten rod kit to add weight and/or accept a magwell that makes reloads super easy. It also has a higher undercut for the trigger guard and a higher beaver tail to improve recoil control. 

Designed for competition, this is a nice feeling full-sized grip for not a ton of money, just $120 MSRP.

Need something even better? SIG offers the TXG, and I kind of love this grip. MSRP is $300, and the design is the exact same as the X5, but instead of normal polymer, the TXG is made from tungsten-infused polymer, making it a LOT heavier. It can also take the magwell and internal tungsten weights. 

The heavy grip eats recoil and feels outstanding in your hands.

But you can make it even better. SIG now has the DH3 grip. The same grip was used in their DH3 P320. This is basically the TXG but with a new, super-aggressive grip. Designed with input from Daniel Horner, the DH3 has basically 320 grit sandpaper on the sides and front/rear backstrap of the grip. This locks your hand in place and gives some insane control.

Both the TXG and DH3 are 16.6 ounces with the weights and magwell installed.

All three of these grips are designed to work with the newer P320 magazines and won’t work with older designs. If you already have P320 mags, take a look at SIG’s website for more details.

SIG Sauer AXG

The first metal grip module for the P320 from SIG was the AXG. And… it is a grip module. Frankly, I don’t love this one. In fact, I barely like it. 

If you’re a big fan of P226 pistols, I think you’ll really dig this grip. It has basically the same feel overall while also having grip panels that can be changed out for a more custom grip. Texture, color, and even size can be tweaked using the grip panels. 

There is nothing wrong with the AXG, I just don’t love how it feels in my hand. I also don’t love how the P226 feels, so that makes sense.

MSRP is $400. If you’re willing to spend that on a grip, I would say you should consider the Icarus instead.

BEST P320 SLIDES

In a lot of ways, a slide is a slide. Kind of like an AR-15 upper receiver, there really isn’t much that can go wrong with a slide that is made to spec, and a great one won’t turn you into John Wick.

That said, there are a LOT of options out there for the P320, and some have some very cool features.

Agency Arms EXA 

There is a lot to like about the Agency Arms EXA.

Top of the list is the AOS Optic Plates. These are optics mounting plates custom to Agency Arms. They provide a rock-solid foundation for your optic, the ability to change optic footprint based on the plate used, and let you choose irons in front or irons behind the optic. Think of it like the Glock MOS system, but actually made well and with more options. 

The AOS is awesome. The finish and work of the slide are wonderful. We’ll talk more about it, but the Agency Arms barrel is also basically a work of art.

But I have one issue with this slide that stopped me from loving it. The edges on the front are almost sharp. 

I’m someone who almost exclusively uses front serrations to rack a pistol slide. The serrations on the EXA are great, but where the corner of the slide turns is a hard, sharp edge.

While I haven’t cut myself on it yet, it’s sharp enough it to be uncomfortable and makes my fingers pretty sore after an afternoon of drills.

If you rack from the back or off an optic, this isn’t a problem. But for me, and the way I manipulate a pistol, it wasn’t my favorite. 

Grey Ghost Precision

One word comes to mind about the GGP slide: Clean. Something about it just feels smooth and well-shaped, like a sports car that seems to still be in motion even when sitting still. 

The front serrations are deep and aggressive without getting too overboard. And the back plates are pretty cool looking, even if they are branded.

I don’t feel like this slide did anything more or better than most of the others, but it quickly became one of the slides I liked using the most because of how simple and clean it looked and felt.

Overall, I dig it.

Killer Innovations

I did a lot of shooting with the Killer Innovations slide because of the comp and barrel testing. Kind of like the GGP slide; this one felt clean.  Serrations give a good bite but won’t sting. And because the slide and comp were made by the same people, they flow together really well.

The finish on it is surprisingly robust. I dropped this on concrete more than once, and it shows no sign of it at all.

I’ve always been a fan of Killer Innovations’ work, and the P320 slide keeps that going. If a highly durable finish is what you’re looking for, I think KI should be at the top of your choices. Plus, the comp is great. But more on that later.

L2D Combat

Sold as a complete unit or as just the slide if you want it, L2D does a great job on their whole lineup. The serrations are deep and plentiful, the window cuts let you see the barrel and help dissipate heat without looking weird, and I just love the lines on the entire slide.

Pure looks alone, L2D was my favorite of the ones I’ve tested. That’s totally subjective, but it really does look amazing.

Not only that, but I also ran the L2D a lot, and I ran it hard. Flawless function.

ShaloTek

This is a slide that absolutely surprised me. ShaloTek makes a P320 slide with a compensator built in. This is a part of the slide and has nothing to do with the barrel, except for the fact that these slides use a shorter 3.6-inch sub-compact barrel instead of the normal 3.9-inch carry-size barrel.

I’ve shot integrally compensated slides before, and I’ve shot ported barrels before. Rarely have these ever worked very well, and never have they worked as well as a barrel with a true compensator on it. So I’ll be honest, my expectations were pretty low going into this.

ShaloTek blew me away. Not only does this slide work really, really well, but it runs flawlessly, and cuts down on muzzle flip in a big way.

Shooting 124gr standard 9mm ammo, I can feel and see a huge difference between the compensated ShaloTek slides and a bare P320. Follow-up shots are significantly faster and easier to make due to radically less muzzle climb per shot.

This also came with me to Utah for the InRangeTV Desert Brutality. My CCW build flew through the stages and performed only a couple of seconds behind my full-size run on many stages. I credit the ShaloTek slide with a lot of that.

Grayguns Modern Classic Bull Barrel Slide

Only offered as a complete slide with a barrel and all internals, Graygun slides might feel a bit expensive – but they perform outstandingly well. These are not flashy slides, these are workhorse slides that keep it simple and excellent. 

The front serrations are deeply cut and easy to grasp, there are no windows or vent holes, nothing that you don’t need.

Something that makes them stand apart is the bull barrel. It is an extra thick barrel that add a lot of weight to the end of the gun and, in doing so, helps tame muzzle flip and gives the recoil a longer, smoother feel. 

All of the slides can be cut for optics, including the Romeo 3 Max. 

Zaffiri Precision

Another part I used for Desert Brutality, Zaffiri Precision, has a huge assortment of colors, styles, coatings, and cuts on offer. Mine is an oil slick or chameleon multicolored slide with extra porting cuts to dissipate heat. 

Mostly, this slide just looks amazing, and that’s why I like it. It also functions 100 percent, but that really is as expected for a slide. Serrations are aggressive and easy to rack, optics cut is well done and in spec, but the real highlight is just how awesome it looks.

If you want to custom choose a slide and have it made to order, Zaffiri Precision does great work.

BEST P320 BARRELS

I’m kind of a snob when it comes to barrels for my long guns, but pistols, it’s hard for me to get excited about X barrel vs. Z barrel. I’ve done large tests of the best barrels for several firearms now, and I still honestly rarely see much difference.

If you’re on the fence between barrels, get the one you like the look of most or the one that fits your budget best. 

Or just get the same brand as your slide so that things match up.

Unless a barrel does something specifically different, like Killer Innovation’s barrel that fits with their compensator and has special cutouts for set screws, the difference between barrels is negligible almost always. 

Agency Arms

It can be hard to tell how accurate pistol barrels are without a high-end rest and really fancy ammo, but if I had to say who was the most accurate of the “normal” barrels I tested – Agency Arms would be the winner.

While it was never night and day, and no barrel performed badly, I still say these performed a little better than the rest when it came to putting multiple bullets close together.

For that, I say Agency Arms is pretty great.

L2D Combat

Definitely more accurate than the factory SIG barrel, the L2D barrel was another hit with me. I’m a sucker for burnt bronze, but it also just ran wonderfully.

While I ran this in several grips, I also ran the complete L2D slide in the Strike Industries SMC Chassis for Handgun Brutality. Shooting in the PCC division, this barrel helped me make hits out to 75 yards. That’s not bad at all for a carry-length barrel in what is basically a P320 with a brace. 

Not only was it accurate, but the barrel also performed under long strings of fire and in some really dusty conditions.

Killer Innovations

The standard barrel is a standard barrel, but the threaded barrels from Killer Innovations that are built to work with their comps are a nice touch. 

The KI comps have two set screws to keep the comp from turning. While these can work on any barrel, they work best on the KI barrels because the KI barrels have a cutout made for these set screws.

If you already have a barrel you love, maybe it won’t be worth the extra money. But if you’re building from scratch or have a basic OEM barrel you want to drop, the Killer Innovations threaded barrels are really nice.

Faxon Firearms

I'm a pretty big fan of Faxon Barrels because they’re a good price and they work well. Plus, I really dig flame fluting, and Faxon almost always offers that with all of their barrels.

These were no different and exactly what I expected from Faxon. They worked, they look good, and the flame fluting is just cool.

Grayguns

Putting the BULL in “Bull barrel,” the Grayguns barrel is not small. Not even close. This boy is corn-fed and farm-raised.

Not only giving the slide more heft, but the bull barrel is also super accurate. While I would say the Agency Arms barrel is the most accurate “normal” barrel, Grayguns isn’t what I would call normal.

Side by side with my 10mm SIG XTEN, the bull barrel makes the normal P320 almost the same weight and balance. That’s how beefy this barrel is.

More steel means a more rigid barrel, a barrel that helps soak recoil and keep the gun flatter during firing and is generally stronger in every respect.

This big boy won’t come cheap, but for a dedicated competition build – I think this would be my winner.

You’ll need one of Grayguns’ custom slides that fit the bull barrel, but it’s worth it.

Zaffiri Precision

If you want basic barrels that everyone else has, you can get them. But if you want a barrel with some more pizzaz, some more flash, that looks way cooler than you do, Zaffiri Precision has you covered.

I know these barrels won’t be everyone’s thing, but I love them. For a range gun or a competition gun, I say make it look amazing. And amazing they do look.

Zaffiri Precision shoots well, looks great, and isn’t a bad price to boot.

You can get a more tame-looking barrel from Zaffiri that still looks better than most, but the more outrageous designs they offer are my personal favorite.

BEST P320 COMPENSATORS

Compensators, in general, get a lot of debate on the internet, but compensators on pistols often inspire a whole new level of slap fights.

If you want to read a lot more detail on the topic, I strongly recommend an article from CONCEALMENT Issue 5. 

Bottom line, I am strongly pro-compensator.

Why? Because flatter shooting guns are a good thing. Always. Comps do not compromise your Mark I Eyeball’s night vision, and shooting from retention is not difficult with some training.

That said, not all comps are made equal. Some really are barely more than gimmicks put out by machinists that just saw a block of metal with three holes selling for $300, and some are highly engineered and iteratively designed so they give you the maximum performance possible.

Keep in mind, comps fair best when you give them gas to work with. This means hotter pistol ammo can actually prove to shoot flatter than lighter ammo simply because the comp has more gas to keep the pistol flat.

Don’t judge a comp based on your 115gr bulk pack import ammo. Judge it based on the hottest ammo you shoot. Normally, that means your defensive ammo. 

Killer Innovations Velocity Compensator

One of the most simple to install comps on the market, and for sure the easiest to uninstall, the KI comp might feel like a lot of parts and a little fiddly when you first get it – but it’s actually a lot easier than it looks.

Using a locking nut and a ratcheting system to install, this comp is rock solid. Ultra easy to time onto the barrel, two set screws help ensure the comp never moves on you when you don’t want it to.

As for effectiveness, with standard 115gr ammo, I can tell a difference with the comp installed. With my normal 124gr ammo, it matters more. And with +P ammo, it makes a big difference.

Most pistol comps don’t do a lot to change the felt recoil of the pistol, but they do a lot to reduce muzzle flip. Killer Innovations was no different in that regard for me. 

If you want to stay flat and on target, this is a great option.

Tyrant CNC T-Comp

Slightly harder to install than KI’s, the Tyrant CNC comp still wasn’t hard to figure out and get working. Another comp that really tamped down muzzle flip; I really liked shooting with it.

I put a lot of rounds through this comp since it was on one of my Desert Brutality guns, and it helped a lot with staying on target and moving quickly through the course of fire.

Again, it works best with slightly spicy ammo, but it still makes a difference even on lighter 115gr bulk ammo.

ShaloTek Integral Comp Slide

I know these are slides, and I already talked about them, but just in case you skipped down here looking for a compensator, I’ll risk repeating myself.

ShaloTek is a slide with an integrally cut compensator. And it actually works. Using a subcompact (3.6 inches) barrel, these are compact-sized slides that deliver a lot of performance. They fit well for carry use, and they won’t break the bank. Plus, fewer points of failure since the comp is part of the slide.

If you want a CCW comp, I really recommend taking a look at ShaloTek.

BEST P320 TRIGGERS

If you want to make your trigger pull better, there are a few ways of doing it and a few different parts of the pull that you can address.

First, you have the pre-travel or the amount of movement the trigger has before it actually does anything.

Then you have the wall and break, the amount of resistance you feel and must overcome to actually fire the gun.

After that comes the overtravel, or how much past the break the trigger can go before stopping.

Lowering all of these make for a more crisp and more accurate trigger. But not all of these are equal. The nice thing about the P320 is that you can tune just about all of these individually if you change the right parts.

Everything about your trigger is going to be a personal preference. 

Grayguns

Designed for range and competition use only, I really like most parts of this kit.

For a one-and-done kit that makes the trigger feel a LOT better, Grayguns has you covered with no muss and no fuss. Reasonable price, springs that make a big difference, and a polished sear that moves mountains when it comes to making the break crisp and wonderful.

While the trigger shoe feels great also, I really hated installing this shoe. Granted, I’m not a SIG guru or anything, but I found the shoe really difficult to install. There is a ledge at the top of the trigger pivot that makes getting it on the trigger bar harder than it needs to be.

It’s doable, but it took me a while. If you’re not trying to install and uninstall a whole series of trigger shoes like I was, this isn’t a huge deal. But it’s worth mentioning.

One big plus of the Grayguns trigger is this is adjustable for overtravel. Using a small screw on the back of the trigger, you can play with it to get just the right feel for you and your gun.

For the price, this is an incredible kit. 

SIG Armorer

All other trigger kits wish they were this one when they grow up. 

SIG Armorer changes basically everything about your trigger pull. Front to back, top to bottom, nothing is the same. And it’s a HUGE change. 

Stock P320 trigger isn’t horrible, but with the SIG Armorer Competition kit, the trigger becomes the best striker fired I’ve shot.

Its 3.5-pound pull has a super crisp break, with barely any pre-travel and almost zero overtravel. This is a trigger that feels nothing like stock standard. 

SIG Armorer also has a carry version of their kit that has a 4.5- to 5.5-pound pull. Personally, I really love the comp trigger and highly recommend it.

This is a lot of kit with a lot of options. And it isn’t cheap. If you’re on the fence about aftermarket triggers, this might be a little deep to jump into. But if you want the best, this is it.

Apex

Frankly, I was kind of disappointed with this kit. For the price, I expected a bit more. Owning, using, and loving my Apex kits in my Glock and S&W airframe, I expected more.

Then I read the instructions, and I found out that you really should read the instructions first.

Apex’s website clearly says: “In X-Series models, does not reduce pull weight but does reduce overall travel by approximately 10 percent.”

So that’s my bad. 

If you have an X-series P320, skip this kit.

If you have a pre-X-series P320, I would say this is worth looking at. But I don’t have a pre-X-series P320 to test it on, so I can’t really say for sure.

Agency Arms

This is a highly controversial trigger, so get your pitchforks ready.

While mainly a trigger shoe and not a complete replacement, this is a shoe that is very different from the rest. This shoe has a safety. If you’ve ever fired a Glock or almost any non-SIG striker-fired pistol, you know what kind of safety this is.

The upside is that this is another layer of safety for your SIG P320. The downside is some people really, really hate it. Why? Because it works exactly as it is designed to work.

All of the bad reviews I’ve seen for this trigger are from people that complain that if you choke up on the trigger, you can’t pull it.

I don’t know what these tactical geniuses were expecting, but they’re right. The trigger safety works exactly as it is designed to work. Go figure.

While the Agency Arms trigger was never a problem for me, and I like the feel of it on my finger, I don’t think I would go so far as to say this is a must-have upgrade for the P320.

That said, if you have any concerns about the P320’s safety, maybe one of these triggers will put your mind at ease. If I were the kind of person that carried appendix, I would have this on my EDC.

Also, this comes with several striker sear springs that help lighten the pull slightly. While they do work, they aren’t remotely as good at improving the pull of the trigger as Gray Gun or SIG Armorer kits are. If you want to overhaul the trigger feel, get one of the other kits to go along with this.

Tyrant CNC

Another trigger that is just the shoe; this is one of my favorite trigger shoes. Simple, works, and feels good on my finger.

I might be a little biased since I’ve been running a Tyrant CNC trigger shoe on my EDC Glock for years. This feels familiar to me, and I like it.

Another bonus is these look really good. Not the top of my list for a carry trigger, but still a nice touch.

Again, this is just the shoe. If you want to change the way the trigger pull feels, don’t forget a kit!

BEST P320 EXTRAS

Strike Industries SMC

This is an extra that deserves a complete review, so for now, this is just a teaser. 

The SMC is way more than just a grip, it’s a whole contraption that not only gives your P320 FCU a grip but also adds the ability to attach braces or stocks via 1913 railing. And it has a bridge for mounting a red dot that is independent of the slide.

All you need is a P320 FCU and a P320 slide. Combo that with the SMC, throw on a brace, and you have a P320-based PDW (Personal Defense Weapon) with a lot of flexibility. 

While not as good as a true PCC, this is a big step up from a bare pistol. Think of this kind of as the MP7 you can have at home, except chambered in a real cartridge like 9mm.

This system isn’t cheap, but it delivers a lot of bang. 

Killer Innovations Basepad

You might look at something like basepads and think they are kind of boring, and they are all the same. For the casual user, that might be at least a little true. But if you want to shoot competition, you’ll quickly run into all sorts of weird issues about magazine length and find out that a lot of basepads only look pretty right before shattering the first time you drop them on concrete. 

I only had one Killer Innovations basepad to play with, but it survived getting dropped on concrete without a problem. I also liked the added weight it gives a magazine for a more reliable drop-free ejection. 

Grayguns Basepad

A big, thick, block of metal, the Grayguns pad is strong and heavy. For adding a lot of weight to the bottom of the mag or if you're constantly dropping it on a hard deck, these are going to get the job done and then some.

Plus, they just look good.

There are a lot of pads on the market, but I can vouch for these ones.

L2D Combat Co-Witness Fiber Optic Sight

When it comes to irons, I’m pretty picky. Half the time, I just skip irons on a pistol I build since I can’t find anything that I really like. But for the L2D sights, they really nailed them. Tall without being in the way, blacked-out rear sight, bright fiber optic front sight with a fiber optic that actually stays in the sight, and an overall clean look about them.

I dig these sights. Easy to use, accurate, and never had a problem.

Tyrant CNC Extended Magazine Release

I have short thumbs and tend to want an extended mag release on almost all of my guns. But there is a fine line between a mag release that is longer and easier to hit and one that is in the way and digs into your hand. Weirdly, finding a good extended mag release can be kind of hit-and-miss.

Tyrant CNC’s is a hit. Not too long, not too short, and it’s well beveled so it doesn’t cut into your soft bits. The deep serrations still give a lot of purchase, so getting a firm press is pretty easy.

Tyrant CNC Magazine Extension

Again, not all mag extensions are made equally. Built for standard 17-round P320 mags, these extensions give you more rounds to shoot, improve the spring strength of the mag, and give some extra weight for a better drop-free experience. 

I had zero problems, the installation was easy, and the springs worked great. Plus, they come in a range of cool colors and have the signature Tyrant CNC look about them that I like.