There are a lot of contenders out there for the title of favorite modular pistol, but it’s hard to argue against the Sig Sauer P320.
At its core, the P320 is a fire control unit. You can remove the FCU and combine it with a variety of different size grip modules, slides, barrels, calibers, and more. It’s like Legos for grown-ups!
This modular nature has, of course, given us a massive market for upgrading and tuning this gun… which can be dizzying.
Worry not! We gathered a few of our favorite upgrades and hit the ground running.
THE QUICK LIST
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Best Premium Grip Module
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Best Barrel
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Best Compact Compensator
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Best Magazine Extension
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Best P320 Magwell
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Best Red Dot
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Best Slide
Table of Contents
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How We Test the Best Sig Sauer P320 Upgrades
Input for this article came from the entire Pew Pew Tactical staff. Our team experience includes law enforcement, military, competition, instructing, and recreational shooting.
We’ve put thousands upon thousands of rounds through the Sig Sauer P320 in its various configurations – both factory original and heavily modified. We’ve also gotten hands-on time with upgrades for other firearms, so we have a good understanding of what you should expect when you upgrade a particular component or add an accessory.
Best Sig Sauer P320 Upgrades
1. Sig Sauer AXG Grip Modules – Best Premium Grip Module
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Prices accurate at time of writing
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Pros
- Premium feel, fit, and finish
- Reduced recoil
- Keep your current FCU
Cons
- Metal frames are very expensive
One of the best features of the Sig Sauer P320 is the fact the actual firearm portion is the internal chassis system, which is removable from the gun’s frame. The frame, or grip module, is not considered a firearm.
The result is you can order entirely new grip modules without the need for an FFL.
You can change the size of the gun by changing the grip module — you can also change the entire look of your weapon.
AXG grip modules replace polymer with metal. This add weight but absorbs recoil energy better.
These grip modules come in various finishes, including the classic and scorpion.
Sadly, they are a little expensive. But boy, oh boy, they are rather sweet to have and to hold.
2. Sig Sauer X-Series Modules – Best Value Grip Module
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Prices accurate at time of writing
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Pros
- Improved ergonomics
- Great price
- Several colors available
Cons
- Not as fancy as the AXG grip modules
The X-Series Grip modules provide you with an awesome, ergonomic frame that certainly takes a step up from the standard module.
We get a more aggressive grip texture, a better beavertail, and a higher trigger guard undercut, all at a very low price.
If you’ve got about $50 to spend, you can make a significant upgrade to your stock P320.
3. Mirzon Enhanced Grip Module Gen 2 – Best Aftermarket Grip Module
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Prices accurate at time of writing
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Pros
- Extended beavertail
- Comfy rubber grip panels
- Compatible with many optional Sig Sauer components
Cons
- Finger grooves – you love ’em or hate ’em
Maybe you want to take advantage of the easily swappable grip modules, but you want something that goes beyond what Sig offers.
If that’s the case, then this Mirzon Grip Module is for you. It differs from the OEM modules in quite a few ways.
First, the grip features finger grooves and lots of people like finger grooves.
Backing those finger grooves is a series of over-molded rubber grip panels. Those panels are quite comfortable and add a hefty degree of grip texture to the module.
We also get a massive beavertail that allows the user to establish a high, firm grip for better control.
The Mirzon is compatible with the X-Five weight to help reduce recoil, as well as an optional safety notch. It has compatibility with Gen 1 and Gen 2 takedown levers and X-Series magwells.
4. Faxon Firearms P320 Barrel – Best Barrel
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Prices accurate at time of writing
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Pros
- Excellent accuracy
- Several lengths and finishes to choose from
- Threaded options available
Cons
- Not the most noticeable improvement for the money
Faxon Firearms makes some slick gear and fascinating guns. They also produce some outstanding barrels. If you are going to sink money in a better barrel, I’d buy the best.
Faxon has a bunch of different barrel options for the P320.
Of course, you have full-size and compact lengths, but also lots of finish options. This includes TiN, rainbow, and gloss black.
The barrels also fluted in what Faxon calls their flame-fluted pattern. It gives the barrel a beautiful look overall.
Want to run a suppressor or compensator? They have threaded P320 barrels too!
These barrels are rock solid, well made, and a perfect upgrade for your Sig P320; especially if you want to add a muzzle device.
5. Griffin Armament Micro Carry Comp – Best Compact Compensator
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Prices accurate at time of writing
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Pros
- Reduces muzzle rise
- Barely larger than a thread protector
- Affordable
Cons
- Requires a threaded barrel
Compensators on competition guns might be the standard, but they can be tricky on carry guns. If you don’t want to add a ton of length to your gun, then I have an option for you.
You’ll still need a threaded barrel, but the Griffin Armament Micro Carry Comp keeps things small. It’s hardly bigger than a thread protector but provides three mini ports to reduce recoil and muzzle climb.
It’s not as effective as a full-sized comp, but you’d be surprised by how much of a difference it makes, especially on smaller pistols. I equipped the Micro Carry Comp to my P365 and CZ P-10C, and it took some sting out of both guns.
It’s an affordable upgrade that’s easy to carry and downright cheap.
6. Springer Precision P320 Compensator – Best Full-size Compensator
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Prices accurate at time of writing
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Pros
- More effective than other compensators
- Compatible with unconventional threads
- Rated for +P ammunition
Cons
- Long and bulky
Springer Precision produces compensators for that goofy Sig M 13.5 x 1 LH thread twist. They also provide a standard Sig Compensator for the ½ x 28 threads.
This comp has three ports that allow for a significant level of muzzle rise reduction. It’s also rated for 9mm +P and 9mm Major loads.
This compensator is pretty long and isn’t going to work great for any kind of concealed carry. It’s made for competition guns, and that’s where it is best suited.
It’s also great if you want to have fun shooting your Sig P320 fast with minimal recoil and muzzle rise.
If that’s too long for you, the Shorty is a little more portable. It has a single top port and two side ports and is designed for standard 9mm ammunition. This one is better suited for a carry gun.
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Prices accurate at time of writing
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7. Springer Precision Magazine Extensions – Best Magazine Extensions
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Prices accurate at time of writing
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Pros
- Compatible with Sig’s tricky magazines
- Machined from aluminum
- Wide range of extension sizes
Cons
- Expensive
Finding extended magazines for the P320 is kind of a pain. I own a PCC that takes P320 magazines, and being stuck with 21-round magazines is a hassle. If you compete in various classes of competition shooting, you might just want a longer mag to lessen your reloading needs.
Springer Precision machines a series of magazine extensions that allow you to expand your magazine sizes at will.
I’m not just talking about +2 or +3 extensions. I’m talking magazine extensions that go up to +10 for your 17-round P320 magazines.
They also have +5 extensions and offer various extensions for 9mm, .40 S&W, and .45 ACP variants of the P320.
These magazine extensions are made from aluminum and machined to have extremely tight tolerances. Big extensions come in a range of colors.
It’s one of the only options I know of that offers higher capacity without sacrificing the reliability of factory P320 magazines.
8. Agency Arms X-Series Magwell
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Prices accurate at time of writing
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Pros
- Excellent build quality
- Small enough for a carry pistol
- Easy to install
Cons
- Only compatible with X-Series grip modules
Agency is one of the original Glocksmith-style gurus who pushed the Glock platform forward. They’re now working on the P320, and that’s where we get the X-Series Magwell.
This magwell is purely for X-Series grip modules, which are slightly different from the standard P320 grip module.
These are concealed carry-orientated magwells that speed up those pesky reloads in the midst of a gunfight (or Instagram video) without making your pistol bulky.
9. Sig Sauer ROMEO1 Pro – Best Red Dot
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Prices accurate at time of writing
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Pros
- Available with a 3- or 6-MOA dot
- Good value
- Easy installation
Cons
- Not as rugged as an enclosed emitter
The ROMEO1 Pro is an upgraded variant of the original ROMEO1. The Pro variant packs a longer battery life, a clearer window, and a more durable design.
On top of that, we also have an optional metal shroud to keep the optic protected against the brutal world around it.
I’ve beaten the hell out of mine, and it works wonderfully. It’s been tossed, kicked, dipped in water, and it just keeps going.
You can choose between a 3- or 6-MOA red dot. There are 10 daylight brightness settings and two night vision settings, and the battery lasts for a claimed 20,000 hours.
10. Killer Innovations Velocity V1 – Best Slide
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Prices accurate at time of writing
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Pros
- Reduced reciprocating mass
- Excellent grip
- Cut for the RMR and DeltaPoint Pro footprints
Cons
- Only fits compact P320 pistols
Decked out, cut up, optic-ready slides are all the rage these days. While they might look cool (and looking cool rules) they also serve a purpose.
Less weight means a lighter carry pistol, and less reciprocating mass means less recoil.
The Killer Innovations Velocity V1 slide does just that, trimming a little over three ounces from the slide of a compact P320. It also looks damn good.
This slide comes complete with weight-saving cuts and an entirely new grip texture.
This enhanced grip feature tosses out the idea of traditional serrations and replaces it with a positive wall you can press against as you rack your firearm.
The E.G.F. cuts are made to the front and rear of the slide. On the top, we have an RMR/DeltaPoint Pro cut for optics like the Trijicon RMR, Leupold DeltaPoint Pro, along with popular Holosun and Swampfox optics.
This specific slide will only fit compact P320s.
11. Apex P320 Trigger – Best Trigger
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Prices accurate at time of writing
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Pros
- Curved, semi-flat, and flat profiles
- More consistent trigger pull than OEM
- Compatible with Sig Sauer Voluntary Upgrade components
Cons
- Not quite competition-grade
Apex Tactical is a big name in aftermarket triggers. Currently, there are tons of companies producing aftermarket triggers, but the majority of them focus on Glock triggers.
Apex dives in deep with a wide variety of different guns, including Sig P320 triggers. Choose from flat-faced, curved, and semi-flat profiles.
Something about these triggers makes me feel like I am more in control. A more consistent trigger will help you shoot straighter and faster.
The Apex trigger systems are fantastic, and they do work with Sig’s voluntary upgrades.
The Apex system is straightforward to install, and you can do it at home. It’s also an affordable option for those on a budget.
You can buy the set combined with a trigger and trigger bar, or you can purchase the parts separately.
What do you think of Apex triggers? Rate them below!
12. Bravo Concealment OWB Holster – Best Holster
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Prices accurate at time of writing
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Pros
- Good for OWB concealed carry
- Kydex construction
- Comfortable
Cons
- Relies on friction for retention
Choosing a holster is an important consideration. I prefer OWB, and this is my list, so deal with it. In general, the P320 is a big gun anyway, and it’s excellent for OWB carry.
Bravo Concealment makes one of the most concealable OWB holsters there is. This Kydex holster is designed for close-body concealed carry.
The OWB model features a slight forward cant to increase concealment, and the belt loops can be adjusted for a high ride for more concealment.
This Bravo Concealment holster can use 1.5, or 1.75-inch belt loops and Bravo also makes a paddle system, if you prefer that. Bravo has rounded off the edges of the holster, and this allows you to carry the gun comfortably without anything being pressed into you.
The holster uses a passive retention system that locks around the trigger guard. There is a very satisfying click as the weapon is holstered. This retention also allows you to draw unimpeded without worrying about the gun falling out.
It makes concealment — even with a larger gun — easy.
13. Surefire X300 – Best Full-Size Light
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Prices accurate at time of writing
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Pros
- Extremely durable
- Very bright
- Intuitive controls
Cons
- Expensive
The Surefire X300 light is the gold standard for duty guns. It’s incredibly well-made, insanely bright, and built for serious duty use. I’ve seen these things get beat to hell and they still keep working.
The X300 comes in a variety of lumen counts, up to 1,000 lumens. Modes include constant on, momentary, and strobe.
The light uses a TIR lens which shoots a bright and clear light that’s concentrated for extended ranges.
It’s a big light and adds some bulk to your gun. For duty or home defense, it isn’t an issue. For concealed carry, be prepared to get a holster and a good belt.
14. Streamlight TLR-7 Sub – Best Compact Light
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Prices accurate at time of writing
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Pros
- Small enough for a CCW pistol
- Durable
- Great value
Cons
- Touchy controls require discipline
The TLR-7 Sub is a compact weapon light that sits flush with the rail and the barrel of Glock 19-sized guns. The TLR-7 is ultra-lightweight, easy to use, and perfect for concealed carry. Toss it on a SIG P320C, and you are ready for shooting 24/7.
The TLR-7 is a 500-lumen light with a 1.5-hour runtime. It has ambidextrous on buttons that are easy to reach. The light is made from aluminum and is IPX7-rated for full submersion in one meter for 30 minutes.
How to Choose the Best Sig Sauer P320 Upgrades
Upgrading your pistol can be fun, especially when it’s as easy as swapping out parts on a Sig. It’s also expensive, though, so we recommend coming up with a plan before you start throwing money at upgrades.
What do you want to improve about your P320? If you want more personalized ergonomics, put your cash toward a grip module. Want more accuracy? Look at a trigger or barrel. If you’re chasing speed, a compensator or weight-relieved slide might do the trick.
Once you know what your end goal is, you’ll be able to pick and choose the individual upgrades that will give you the most bang for your buck.
How to Disassemble Your Sig Sauer P320
Disassembling your P320 to install new components is easy. We made this handy instructional video for all you visual learners, so follow along!
Why You Should Trust Us
I am an NRA-certified instructor and CCW trainer out of Florida. I served as a Marine infantryman in my prior life, so I’ve had plenty of time behind guns.
Between instructing, serving in the military, and testing and evaluating firearms over the years, I’ve come to learn a thing or two about pistols and upgrades.
FAQs
Can you customize a SIG Sauer P320?
Yes, that's one of the best things about this pistol! The P320 uses a serialized fire control unit, which means you can swap out any other component without going through an FFL. Most upgrades are easy DIY jobs that you can do at home with basic tools.
Which SIG Sauer P320 does the military use?
The U.S. military selected the M17 and M18 (both based on the P320) to replace the Beretta M9.
What is the P320 Voluntary Upgrade Program?
Sig Sauer will upgrade any P320 with outdated components at no charge. Enter your P320's serial number on Sig Sauer's website to see if it's eligible. If it is, Sig will add a mechanical disconnect to the slide and upgrade the trigger, sear, and striker.
Final Thoughts
The Sig Sauer P320 is one of the best and most modular firearms in the world. The ability to swap calibers, frame sizes, and more makes this a fantastic little gun.
Its versatility, as well as its adoption by multiple police forces and the United States military, are going to continue to drive a massive aftermarket.
This is just a taste of what’s available now, and what will be available in the future is unpredictable.
What have you guys done to your P320s? Let us know below. Interested in learning more about these handguns? Check out our complete Sig Sauer P320 review.
Latest Update
July 12, 2024: Added more details to product selections and updated supporting content. Removed Springer Precision Magazine Wells.
40 Leave a Reply
Sig now sells factory 30 round magazines and there are other aftermarket options that don't suck. Please update the article.
The Sig P320 is the one gun I will never get. Many people have reported that the gun has gone off all by itself while in the holster. A lot of police officers report having been shot by the gun even though they didn't touch the trigger. There are many lawsuits against Sig because of this gun. I'm a bit surprised that you didn't include even a comment about these reports, even if it was only to say that you disagreed with the reports.
I've had mine almost 2 years and never had a problem and I carry it everyday and still has not gone off on its own just saying if you keep your fingers off the trigger it doesn't go boom
In court Sig has not lost any cases against people that claim that their p320 went off without a trigger pull. Also, the military has not had a single such issue.
That doesn't mean that there haven't been any cases of the P320 going off without a trigger pull. On Dec 3, 2022, Military-dot-com ran an article entitled "Wounded Officers Sue Sig Sauer, Say Gun Goes Off by Itself", in which 20 people from multiple states said they were wounded by the Sig P320, alleging that the gun is susceptible to going off without the trigger being pulled. There was another article I read about a Minneapolis police officer who was in her car, and the gun was in its holster (but not on her person), and it went off without her touching it. I've read of other cases as well.
No gun goes off all by itself while in a holster with no one touching the trigger.
What’s the name of the grip on first picture?
I've been looking for that one for a while, pretty sure its a custom job.
P320X-Carry... first upgrade was the AXG grip module. The second was a set of black and blue Hogue scales with the small back-strap; the feel is pretty damned good in my awkward hand. My latest upgrade was the Romeo1 Pro. Ironically though, I am not able to get everything fine tuned yet as I am on a bit of a "range hold" because of eye surgery. Aside from that, I am on the fence about a threaded barrel and comp, or getting a cerakote job done to appease my OCD which keeps taking too much notice between the Sig dark grey slide and the hard anodized black grip module (For those who have the pleasure of not suffering from OCD, please refrain from trivial rebukes about something you wouldn't understand).
Anyways, I appreciated the article, and I wish the hate-mongers would just keep their non-sense commentary in their unholy places. We need to focus on more important things like actually being able to maintain our constitutional rights that give us the ability to possess, tune and stylize our means of defense.
The best upgrade for the P320 is to trade it in for a VP9 or PPQ.
Little Billy,
Hasn’t your momma told you if have nothing nice to say don’t say anything at all. You sound like a clueless hater. Better to look foolish than open your mouth and prove it so.
You are stuck with 1 caliber out of that weapon. I can shoot 9mm, .357, .40, 10mm etc. from 'one' firearm. Besides that, the VP9 and PPQ don't exactly do well in harsh environments which is why you don't see 'ANY' of these weapons used by MIL/LE anymore. I have plenty of H&K's but they sit as collectors' items. I'd take a POS Glock over an H&K. At least than, I know it's going to perform wet, cold, hot, muddy etc.
Your opinion is your opinion but the H&K is more of a model than it is a performer. If you don't know stuff, you really shouldn't talk.
does your husband feel the same way??
You could stay in house, P220, P226 or P229 would be good upgrades to the P320.
I swear after reading this article im done with this site. This site is obviously ran by kids who just want to throw crap on a gun they think looks cool or they saw in a movie without any practical purpose. Go ahead and throw this crap on your pistol and you will let everyone at the range know your a rookie.
Sorry you didn't like this article, Joe. We're constantly updating articles around here and would love to know what upgrades you would recommend! Hit us up with some suggestions!
I have an x-01 and it rocks. Joe you obviously don’t know what your talking about. I am a military veteran 20 years of CQB experience and the x-01 is my fav for slicing in a structure. I am really the equivalent of a modern day gun fighter so as to your rookie comment seems we know who that is now. As for adds to the list PMM compensator and barrel, and armory craft or align tactical take down levers.
Who cares what other people at the range think? As a new shooter, I've noticed a lot of "vets" making comments about how to not look like an idiot or be judged by 'their betters'. It just sounds like you're suggesting that people don't make cosmetic upgrades because of how they'll be perceived by "vets"... sounds a little hypocritical. Although the majority of these upgrades don't appeal to me or seem overpriced, I'm glad to check out a variety of possibilities.
How are you gonna post an article about P320 upgrades without mentioning the Wilson Combat grip modules, Armory Craft triggers, or the FLUX Raider? This whole article seems quite half-assed, which seems to describe a fair amount of gun blog content the past few months.
Hey Jayce, sorry to hear you were bummed with our list. This is based on things we have actually tried so if it's not on this list, it means we haven't had hands-on time with it. But we'll be certain to keep those upgrades in mind for future article updates! Thanks!
You should put a disclaimer at the beginning of each article: "We apologize in advance for not including every possible gun or option that the article speaks about."
That's what the comments are for: so the readers can add what you may have missed in the article!
You missed the boat on Springer Precision's extended mag release. Definitively a must have if you need to rotate your hand slightly to release the mag, especially on an X frame grip.
If you you make 1 upgrade to your p320 make it Wilson combat grip module. Surprised it's not on here. My accuracy improved by 80%
I totally agree I added the tungsten weights gives you that 1911 feel.
To achieve that level of a performance increase, I would have to have someone else shoot for me....
"better yet–the Galactic Empire." yikes.
If you think they abandoned the .357/.40 the .45 doesn't share anything but the mag release with the other platforms. Nobody makes aftermarket barrels and I doubt the trigger upgrades would even, fit no factory threaded barrel no nothing. I cant even swap down to 9 as the fcg is larger to accommodate the .45.
I own the .45acp P320. The Apex trigger kit fits and works flawless! True the options are not there as they are for small pistol rounds, but doesn't mean you cant get some trigger upgrades!
Why did you go with the .45? The 9mm has better terminal ballistics and you can carry more rounds. Power I assume? Not the case anymore. 9mm penetrates better than .45 does nowadays and you can carry a lot more 9mm in a magazine than you can a .45 - Educate yourself.
Personally, I put more stock in a .45 than a 9mm because of surface area. The .45 has more mass to and travels at comparable rates to the 9mm. The penetration is another reason I chose the .45. I could sleep at night knowing I shot a killer, but I don’t know how I could handle shooting a bystander. Another aforementioned issue is the capacity. I must admit defeat here, but I would ask you to consider what is better: limited capacity with less penetration and larger surface area, or an increased capacity by a few rounds with greater penetration and less surface area. Ultimately, each person is untitled to their own opinion, and this is mine. God bless.
Just bought the Sig P320 9mm and looking to replace the grip module. I like the photo of the Tan with black stippling above the (This is just a taste of what’s available now, and what will be available in the future is unpredictable). Can anyone tell me who makes this grip module or where I could possibly purchase it if it's available? I would really appreciate the help. Thanks
The only problem I have with the P320 is that Sig have essentially decided to abandon anything other than 9mm with this platform. I bought my P320C in FDE a few years ago with .40 and .357 Sig barrels. I already own several other 9mm rigs and didn't want another. I also bought a Romeo 1.
Unfortunately, the only option I have for mounting it is the ungainly rear dovetail mount. Sig doesn't offer milled slides for anything other than 9mm. Kind of ruins the whole "modular" concept. I love the gun in .357 Sig, I just wish Sig loved it too.
I found the same issue, I have the. 40, but am now converting it to 9mm because there is literally no upgrade options for the. 40..... pretty much blows
For anyone not familiar or having only minimal info about the 320 this article was excellent. Personally I know quite about the actual pistol but had never checked out various barrels, red dots etc. Good overview on Sig's great 320 pistol. Perhaps Mr. Pike could write an update on the newer style RX pistols.
I put a Gas Pedal on the 320 and it is a very good addition to the platform.
How about Obsidian Arms mag base plates? I have a few and they’re pretty sweet.
I've really been enjoying my full size P320RX - and haven't changed a thing, yet... Travis (and all you PewPewers), do you have a light WITH green laser that you'd recommend? How about an OWB holster that could accommodate a suppressor for the fs P320?
Check out the TLR-8. It is like the 7 but with green light.
The Streamlight TLR-2 is slightly larger, but it is my home defense choice. I would also consider the TLR-10 and the Surefire X400.
I like the Zippo brand. Really helps me see where I’m firing. Sorry, I couldn’t help it.