Best P365 Upgrades: Triggers, Barrels, Sights & More [Tested]

The Sig P365 has been a home run in the carry gun market -- wildly successful in the civilian market and even adopted as a backup gun with a few different police forces. 

I’ve gotten my hands on plenty of different accessories and add-ons for the gun and have spent the past few years tinkering with the P365.

So today, let's run through some of the best upgrades and accessories for the Sig Sauer P365. 

How We Chose the Best Sig P365 Upgrades

I’m a Marine infantry veteran, firearms enthusiast, and NRA-certified instructor. In addition to all that, I’ve been carrying and using the Sig Sauer P365 for a few years and have gotten close to 1,700 rounds through the gun.

In that time, how I carried the Sig P365 has changed slightly. With that in mind, I upgraded the pistol to make it a better defensive gun. I wanted to tame the gun’s recoil a bit, make it easier to shoot at various ranges, increase my follow-up shot time, and, of course, make the gun look cool!

All of the products recommended have been tested by me, and spent time on my personal Sig P365.

But first...how to field strip the P365 since you'll likely need to for the following upgrades:

Best Sig Sauer 365 Upgrades & Parts

1. Sig Sauer FCU + XL Slide

Sig Sauer P320 Custom Works Fire Control Unit

$349

at Brownells

Prices accurate at time of writing

$349 at Brownells

Sig invented a modular fire control unit for the original P250, which later went to the P320, and now the same idea lies within the P365.

The legal “firearm” portion of the gun is a removable chassis system that can be inserted into various frames known as the Fire Control Unit.

The FCU is compatible with various frame sizes and P365 models. I’ve taken full advantage of that with my P365.

The modular design appeals to me, and I like having one firearm morph into multiple uses depending on the level of concealment or control I require.

The FCU is the core of the build, and it allows me to swap between various configurations.

My main configuration is a standard P365 frame with the XL slide. I find this an awesome combination that allows for an easy shooting gun that’s highly concealable.

The shorter frame disappears in an AIWB or IWB carry holster.

The longer slide and barrel increase sight radius, velocity, and control. With the two combined, I have a very effective but concealable gun.

Should I want to emphasize concealability above all else, all I need to do is swap the XL slide for a standard slide, remove some accessories, and go with the shortest magazine.

2. True Precision Threaded Barrel

Best Threaded Barrel

True Precision Sig P365 Threaded Barrel

$170

at Rainier Arms

Prices accurate at time of writing

$170 at Rainier Arms

Optics Planet (see price)

I knew I wanted to add a muzzle device to my P365; to do so, I needed a threaded barrel.

True Precision produced the best-threaded barrel on the market.  The ½ x 28 threads make it easy to attach a suppressor or muzzle device, so it was an instant sell for me.

Beyond just being a threaded barrel, the True Precision design accommodated a proprietary broach cut that enhances accuracy, and it is quite noticeable.

My groups tightened slightly after adding the True Precision barrel.

Beyond the broach cut, the barrel fits a good bit tighter, and that also helps in the accuracy department.

Another selling point was that the barrel could use the cheapest, crappiest ammo on the market and function perfectly fine.

3. Sig Sauer P365 Flat Trigger

Best Trigger Upgrade

Sig Sauer P365 Flat Trigger

$50

at Sig Sauer

Prices accurate at time of writing

$50 at Sig Sauer

Do you want to be frustrated? Like really frustrated? Try buying a Sig Sauer OEM-produced P365 flat trigger. 

It’s always sold out. Sig is restocking them and making them as fast as they seemingly can, but the P365 is a popular gun, and this trigger is extremely well-regarded.

The Sig OEM flat trigger is a direct, drop-in replacement system that delivers a smoother, more consistent trigger pull. 

There are other high-quality flat-faced triggers for the P365 out there, but they are often double the price of the Sig OEM model.

This flat-faced trigger positions your finger lower on the trigger and this gives you more control and leverage. This results in a smoother, more consistent trigger pull. 

The Sig Sauer flat-faced trigger gives you a smoother trigger pull without having to change the factory weight. People with smaller hands and smaller fingers often find it easier to reach flat-faced triggers. However, the thin grip of the P365 is likely thin enough for even the smallest of hands. 

4. Griffin Arms Micro Carry Compensator

Best Muzzle Device

Griffin Armament Micro Carry Comp

$49

at OpticsPlanet

Prices accurate at time of writing

$49 at OpticsPlanet

GrabAGun (see price)

Palmetto State Armory (see price)

Comps on carry guns are a fun subject to discuss. I like them, and since this is my build, a compensator was a piece of it.

Since this is a small carry gun, I went with a small compensator -- the Griffin Arms Micro Carry Comp -- the perfect choice.

It’s hardly any bigger than a thread protector but offers ports to dissuade recoil and tame your gun.

“You don’t need a comp on a 9mm!” Naysayers shout.

Need is a strong word. But I agree, I don’t need it. However, I won’t deny its effectiveness.

The Griffin Arms Micro Carry Comp reduces muzzle rise and makes my subcompact pistol quite controllable and much easier to handle.

Seeing my red dot barely move between shots is a satisfying feeling. Best of all, it makes my follow-up shots faster and with greater precision.

The real work is done when you fire the gun one-handed. That was the moment I realized how handy a compensator could be.

Shooting one-handed could be a very real situation in which I could find myself.

So, being able to do so with greater effectiveness makes the Griffin Micro Carry Comp a worthwhile addition to my P365.

The Griffin Armament comp works with most P365 holsters with an open-bottom design.

Most compensators are on the large side and require holsters specifically made for compensated guns. So it’s nice that the Griffin Armament doesn’t require that.

5. Holosun EPS Carry

Best Red Dot

Holosun EPS Carry

$329

at Primary Arms

Prices accurate at time of writing

$329 at Primary Arms

Brownells (see price)

Sportsman's Guide (see price)

Midway USA (see price)

The Holosun EPS Carry proved you can have a small, enclosed emitter design that easily fits onto a Shield RMSc footprint. It’s an impressive accomplishment, and the EPS Carry has since become my red dot of choice on my P365.

The EPS Carry design gives you all the advantages of an open emitter. As a Florida man, I appreciate the enclosed emitter. Rain can get between the emitter and lens and make your dot useless. Rain is my concern, but so is snow, dirt, debris, and whatever else finds its way to the dot.

The EPS Carry comes in a few different configurations, including a fancy model with a solar panel and multi-reticle system. While I like the MRS, I had a little less need for the 32 MOA red dot on my smaller optic. I settled on the 6 MOA dot model and found it to be quite easy to use and well-suited for my shooting needs.

The EPS carry offers you huge controls, a bright and crisp red dot, and a clear view through the optic. Overall, it’s a fantastic option.

If you only pick one upgrade to your gun, then I say get a red dot. A red dot provides you with the ability to shoot faster, straighter, and further with greater ease.

Sight radius doesn’t matter when you’re using a red dot, so you aren’t limited by a short sight radius with a red dot equipped P365.

We did a whole review on the EPS Carry, so check it out!

6. Truglo Fiber Optic Front and Rear

Best Alternative Iron Sights

TRUGLO Fiber-Optic Front & Rear Sights for Sig Sauer P365

$50

at Amazon

Prices accurate at time of writing

$50 at Amazon

If you're not a huge fan of red dots, no worries; you can still upgrade the P365 sights.

I’ve been a big fan of the Sig XRAY3 sights and have had no complaints.

This opinion isn't shared by all though. I’ve seen complaints pop up here and there, as well as some who don’t like night sights on their guns. 

For those looking for something different, the TruGlo fiber optic front and rear are an excellent choice. Sig produces similar sights for most weapons, and they utilize numbers to differentiate their front and rear sights. 

The P365 uses a Sig #6 front sight and a #8 rear sight. The TruGlo Fiber optic sights meet those designations and are conveniently packaged together.

The front sight is a bright red, and the rear sights are green. This contrast of colors makes it easy to pick up the front sight and quick to get on target. 

The TruGlo Fiber Optic front and rear sights are made from CNC-machined steel, so they are well-made and will last. The TruGlo sights are designed for daylight use but are high visibility and easy to see in low light as well. 

They are a great alternative if you aren’t a big fan of the stock XRAY3 sights. 

7. Streamlight TLR-6 

Best Weapon Light

Streamlight TLR-6 for P365

$115

at Ammunition Depot

Prices accurate at time of writing

$115 at Ammunition Depot

Primary Arms (see price)

Lights for tiny guns are rather rare at the moment, especially when your tiny gun has a proprietary rail system.

I don’t like the Olight, and the Surefire is tough to find. I have a TLR 7 SUB on the way, but the TLR 6 is my light of choice until then.

I’ve had one for well over a year now, and it’s yet to let me down.

It’s been abused, used, and present for daily carry for quite some time. The slim build means hardly any bulk added to the gun.

On top of that, the TLR 6 has been popular enough to warrant the holster manufacturer’s attention. You can find a holster that fits with the light rather easily.

Dual buttons form ambidextrous controls that sit in a position that makes them easy to reach with a trigger finger or your off-hand thumb.

The TLR 6 is a combination of laser and light, and you can use the buttons to alternate between three different modes. Modes include light and laser, light only, and laser only.

My only issue is that the light is only 100 lumens. That’s not a ton of power for the light to have, and it only works at extremely close ranges.

I treat it as more of a backup light called upon when my handheld light is down or inaccessible.

The laser is a handy aiming option should I be unable to use my optic or sights. It’s also fun to fire accurately from the hip, ringing steel, and punching paper.

The brighter, more powerful TLR 7 SUB may replace the TLR 6, but that won’t be until I properly test it…and I can find a holster.

What do you think about the TLR 6? Rate it below!

9. MagGuts +2

Best Magazine Upgrade

Sig Sauer P365 MagGuts+2

$34

at MagGuts

Prices accurate at time of writing

$34 at MagGuts

Sig’s success was built on the magazine design and its ability to hold a multitude of rounds.

The P365 originally held 10 rounds, but Sig released a 12-, then a 15-round magazine in short order.

The 12-round magazine is my personal favorite and offers substantial ammunition with a slight extension that gives me a better grip on the gun.

The 10-rounder with the flush baseplate is the most concealable magazine, and I think it serves a purpose if you ankle or pocket carry.

That doesn’t mean the 15-rounder doesn’t have a place in the grand scheme of things. To me, it’s the perfect option to carry a reload with.

It fits in my pocket, and there are tons of magazine holders out there that fit it. This includes Neomag, which makes the best pocket reload option.

Why not carry a reload with a few extra rounds?

It’s not hard to conceal and gives you a ton more ammo should you need to reload.

MagGuts recently released +2 MagGuts for the P365’s 10-, 12-, and 15-round magazines.

To be clear, these are not magazine extensions. Nope, they are literally magazine guts that replace your internal spring, follower, and magazine base plate.

They add no extra length to your magazines but allow you to add two extra rounds to each magazine. My short 10-round magazine now holds 12 rounds. My favorite 12-round magazine now houses 14-rounds.

This allows my subcompact P365 to have nearly the same capacity as a Glock 19.

Installation took no time at all, and my magazines were actually easier to load. After installation, I dumped rounds out of these things to ensure reliability before I carried it. After 300 rounds without issue, I felt confident enough to carry them.

Those two extra rounds are a big deal to me. Honestly, I think every P365 magazine should have MagGuts in it.

10. HSGI Polymer TACO 

HSGI Pistol TACO Mag

$28

at Amazon

Prices accurate at time of writing

$28 at Amazon

One little challenge I had was finding a good mag pouch for the P365. The magazines are too wide to be single stacks and too thin to be a traditional double stack.

That left me searching for a mag pouch that would meet the dimensions and simultaneously not be a piece of crap. 

Way back when I was a cool guy, I was issued a pistol and used old-school TACOs to carry my spare mags on my plate carrier.

I remembered they adjusted for the size of the magazines, so decided to go that route. I snagged a Polymer TACO with the Universal Mounting Clip. 

This allowed me to just toss in my belt and go. The Taco uses polymer panels held together with a flexible shock cord that allows the mag pouch to grow or shrink while retaining retention.

The mag pouch holds the magazines well, and retention is top-notch. 

The HSGI TACO polymer pistol pouches fit on my 1.75-inch belts with the U Mount, and they are easily transferable to additional platforms. The polymer pistol pouches come in tons of different colors and are cut low enough to accommodate any of the P365 magazines. 

The 15-round magazine is the easiest and quickest to draw when reloading. 

Final Thoughts

You can normally judge the success of a gun by its aftermarket. The more popular a weapon is the larger the aftermarket for it will be. And the Sig Sauer P365 is one popular gun!

The benefit, of course, is a lot of cool extras you can toss onto the gun. The above is my favorite gear, but there is no reason to stop there.

You can go quite far when it comes to going Gucci with the Sig P365, though. 

Sig Sauer P365

$450

at Kygunco

Prices accurate at time of writing

$450 at Kygunco

Palmetto State Armory (see price)

Guns.com (see price)

Buds Gun Shop (see price)

Show all prices

I’m willing to bet several of our readers have their own P365s. If so, what upgrades have you made? Let us know below. If you want to see some other badass CCW pistols, take a look at the Best Concealed Carry Guns!

Latest Updates

April 2024: Removed Crossbreed Holster, Holosun 507K, Sig Foxtrot365. Added Holosun EPS Carry.